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math for CS. by Fanny Gommerlirk - Sun, 07 Jun 2015 03:58:35 EST ID:8MLIP4Q3 No.14780 Ignore Report Reply Quick Reply
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I want to polish up some skills, specifically proof by induction, solving relations, and some calc. i think i know where to go for the calc (i learned it from the khan academy like 2 years ago and got a B+ in Calc II) but I can't find anything good for proof by induction or solving relations. i have some old lectures on my HDD but they aren't enough.

should I give in and hire a tutor? there is a top 10 stem school where I live and could get a tutor from physics, math, maybe CS, maybe another field's list but it's expensive.

pic unrelated
5 posts omitted. Click Reply to view.
Rebecca Bludgehene - Wed, 10 Jun 2015 20:50:36 EST ID:wkzayL5P No.14786 Ignore Report Quick Reply
MIT has math courses online free
Edwin Pittdale - Sat, 04 Jul 2015 04:12:10 EST ID:VtQDzEaN No.14811 Ignore Report Quick Reply
I appreciate the advice guys. Thank you!
Jack Wunderfuck - Sat, 15 Aug 2015 01:52:48 EST ID:PrRFulRY No.14859 Ignore Report Quick Reply
OP here again. I'll be studying calc (I have taken calc before and did fine) and discrete math this fall. im worried about the discrete math. my plan so far is to write down all proofs covered and make sure i learn each one and master it. i want to get close to 100% in this class. what tips to you guys have, beyond keeping at it and seeing prof/TAs regularly with questions?
Fuck Worthingway - Wed, 26 Aug 2015 23:04:36 EST ID:Dk8yywxc No.14867 Ignore Report Quick Reply

Make sure you do all of the assigned exercises. Try to do your own proof first on exercises, then look for a result on the internet. Hopefully you will be able to find many of the things you're asked to prove if you can't solve it yourself, but if you look at the result without trying it defeats the exercise of looking for a solution, which might screw you on the exam.

If you are ever lost with anything, work from the definitions and theorems you've used. Often you can solve a difficult problem by breaking something seemingly complicated into its parts, and then using the tools you have on the smaller pieces. The vast majority of professors will only ask you problems that they have previously exposed to you in class, homework, exercises, or at worst from the assigned textbook. If you feel you are struggling and have done all of the exercises and asked for correction from the professor, start doing the rest of the problems from the textbook and look for solutions.

Before you take any exam, at the very least read all of the exercises and questions in the textbook that you have been given. Oftentimes after being initially exposed to an idea without a solution and some time passes, we will be able to find a solution much more quickly than encountering problem without having seen it before.
Sidney Pittbury - Mon, 02 Jan 2017 17:51:19 EST ID:bM58eX3O No.15306 Ignore Report Quick Reply
fuk that, pick up a discrete math textbook. Then keep a copy of Advanced Calculus by Patrick Fitzpatrick around. Then whenever something troubles you about calc, look it up in that bby. It has a lot of goodies. In terms of CS numerical recipes contains most of the algorithms a person could ever want to use, code of them in C, and mathematical explanation of why they work.
Cheers and don't use it to build missiles u dingus,

Crazy Super Golden! by Barnaby Nicklewill - Wed, 28 Dec 2016 02:20:12 EST ID:RbgW2Zpy No.15300 Ignore Report Reply Quick Reply
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How does it do it! Nobody knows!
Barnaby Nicklewill - Wed, 28 Dec 2016 02:21:59 EST ID:RbgW2Zpy No.15301 Ignore Report Quick Reply
Also has anyone worked with python's wolframalpha API thing?
Nell Murdway - Fri, 30 Dec 2016 20:27:46 EST ID:i+CEI2Ll No.15302 Ignore Report Quick Reply
See what I wonder is how does that mouth not just munch up the numbers? I mean it looks like their gonna fall right in.
Doris Bemmlebanks - Mon, 02 Jan 2017 13:28:20 EST ID:RbgW2Zpy No.15305 Ignore Report Quick Reply
These are the questions that keep mathematicians up at night.

TAKE THIS SURVEY SINCE YOU HAVE NOTHING BETTER TO DO by Clara Ducklock - Sat, 29 Oct 2016 17:03:32 EST ID:uIooC5VR No.15256 Ignore Report Reply Quick Reply
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Linear Programming (Decision Mathematics Query) by Wesley Billingshit - Fri, 28 Oct 2016 13:53:23 EST ID:tyLg+ghU No.15252 Ignore Report Reply Quick Reply
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I am having difficulty formulating the following in terms of linear programming

A pig farmer uses at least 800kg of feed daily. The feed is a mix of corn and maize.
The special feed mixture must contain at least 25% protein and a maximum of 6% fibre

The composition of corn per kg is as follows:
Protein: 32g per kg ; Fibre; 27g per kg ; Price £ 0.3 per kg

The composition of maize per kg is as follows:
Protein: 360g per kg ; Fibre: 65g per kg ; Price £0.9 per kg

What is the minimum daily cost for the farmer, for food with at least 25% protein and max 6% fibre.
Comment too long. Click here to view the full text.
Beatrice Sushspear - Fri, 28 Oct 2016 16:54:06 EST ID:ZjFavw7f No.15253 Ignore Report Quick Reply
Without more information I would assume that you can take the amount of feed the farner needs to be exactly 800kg. Since there is no deal or discount for buying more corn or maize, any additional mass of feed will cost more money. As you are asked to minimize the cost to the farmer, you should always use the least mass possible.

Now it may be that you cannot minimize the cost and attain 800kg at the same time without buying some fraction of a kilogram of feed. This is probably why the question says "at least" 800kg. You will then need to take your answer and round up to the nearest integer if the feed is sold strictly by the kg and not just weighed en masse.
George Foffingworth - Mon, 31 Oct 2016 09:30:26 EST ID:tyLg+ghU No.15260 Ignore Report Quick Reply
Thank you, this was the only information provided so I shall do as formulated in OP. Thank you Beatrice Sushspear

muh math by Betsy Pushridge - Mon, 16 May 2016 20:04:48 EST ID:RHLOntyV No.15119 Ignore Report Reply Quick Reply
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Is mathematics a discovered (natural) or man-made phenomena?
Personally I think it's natural because it can precisely describe natural events and laws which those events must conform to.
Thoughts on this?
13 posts and 1 images omitted. Click Reply to view.
Eliza Chabberkotch - Tue, 13 Sep 2016 06:59:53 EST ID:9vmmdAPm No.15195 Ignore Report Quick Reply
literally the case.
Shitting Pittford - Sat, 24 Sep 2016 13:14:19 EST ID:NUcfB8E8 No.15213 Ignore Report Quick Reply
I guess you could take the number of classes he's supposed to have in the course of his carreer, calculate the chance of having 1 specific class/totalclasses * 1post/totalnoofposts (from the day of his first class until he actually had the specific class in case)

idk what I said looks confusing to me as well but I don't care enough it's just to get the discussion going
Celty !Iv58NJh.IE - Tue, 11 Oct 2016 20:20:20 EST ID:v3boz4eW No.15243 Ignore Report Quick Reply
That's reasonable.
*shit eating grin*
Mr. Schwitters - Sun, 16 Oct 2016 00:37:47 EST ID:xB0tAwHQ No.15244 Ignore Report Quick Reply
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It's both natural and man-made. Look at that documentary where Zizek is standing in a pile of garbage, and saying, "This is the most natural thing in the world!". Nature is man. Culture is nature. Man is not separate from nature. You can't take biology out of the environment from which the gene evolves.

Well, you hear "Time/space/maths doesn't exist, man" so often. But for whom does it not exist?

I perceive its existence. How do I perceive it? Through my nervous system. My nervous system is receiving billions of signals every second.

Luckily there is a brain there which categorizes those signals for me into distinct tracks based on what has been evolutionary fit. That way, when I see a bear in the forest, I don't take out my ruler and try to measure every hair on his body in order to determine if the bear is a threat. Automatically my brain detects a threat and different glands fire off hormones, etc. and I find some way to keep my pic-a-nick basket.

To get a real answer to this, you have to look at the nervous systems evolved through time, and how nervous systems react to the phenomenal world. We still have amoeba, reptile, mammal, etc. sense, and that affects our perception. The 'tracks' where we store imprints about previous threats/comforts determines our perception.

Euclidean geometry is only an explanation of the world as it relates to the perception of domesticated primates.

We wouldn't see space in 3D if our nervous systems were different. We wouldn't plot points in 3D space if our nervous systems were different. Phenomenal existence only appears as it does because we evolved through all of the other species in the environment and atmosphere that we did.

tl;dr perception is everything, practice magick and cast spells dude
Shitting Trotdale - Sat, 22 Oct 2016 10:53:25 EST ID:ussIY8P4 No.15250 Ignore Report Quick Reply
>We wouldn't plot points in 3D space if our nervous systems were different.

No, we would still plot points in space regardless of how we evolved. Euclidean geometry may be somehow ``favored'' by our biology because it is a good local approximation of the acutal curved space in which we live, but even if a creature evolved in a truly alien geomtery it would still make up the geometry we live in if it was intelligent, just like how we have made up infinite families of alien geometries that don't obviously correspond to our physical reality.

uhhh by Reuben Honeyhood - Sun, 25 Sep 2016 22:57:20 EST ID:Z131bdYa No.15216 Ignore Report Reply Quick Reply
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Can someone please explain to me what's happening here?
The idea of a fraction being made up of other fractions is already weird to me, but why is the answer just flipping them?
2 posts omitted. Click Reply to view.
Shit Goodshit - Mon, 26 Sep 2016 00:06:18 EST ID:XssdERJk No.15219 Ignore Report Quick Reply
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so to step back further, this general formula should apply at all times


Sorry for the triple post but I'm high and I got dyslexia, but that seems to be the relation between them
Cedric Dushtud - Mon, 26 Sep 2016 00:31:13 EST ID:cPdIZNc3 No.15220 Ignore Report Quick Reply
Here's a more intuitive example that I think makes this seem more obvious

0.5 / .025 = 2
which is... (in fraction form)
(1/2) / (1/4)
which is...
4 / 2 = 2
George Dezzlesudging - Fri, 07 Oct 2016 21:30:10 EST ID:GmQCz3Ds No.15238 Ignore Report Quick Reply
1/2 over 1/4. you flip 1 wrong fraction and multiply the 2 fractions together.

instead of .5 / .25 you're doing .5 times 4.
Lillian Daddlekeg - Sat, 08 Oct 2016 22:03:58 EST ID:A2j/BW/W No.15241 Ignore Report Quick Reply
(1/x)/(1/y) = 1*(1/x)/(1/y) = (xy/xy)*(1/x)/(1/y) = (xy/x)/(xy/y) = y/x

If you multiply the numerator and denominator of a fraction by the same value, the value of the fraction stays the same. Here you're just multiplying the top and bottom of the fraction by 2^5*7^2. The 2^5s cancel in the top and the 7^2 cancel in the bottom.
Ernest Cashfeck - Mon, 10 Oct 2016 10:20:43 EST ID:WotAVLKX No.15242 Ignore Report Quick Reply
lol man, dislexia? thats harecore

Help evaluate this integral? by Clara Bardwater - Sun, 25 Sep 2016 02:55:07 EST ID:os0KtXjb No.15214 Ignore Report Reply Quick Reply
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So I'm working on a Calc II assignment, and I'm stuck on a problem that asks for the volume of the infinitely long solid attached.

f(x) = xe^(-x^3), so I can prove that the integral converges. I'm a lazy cunt so I used Wolfram Alpha to evaluate the integral and the answer involves the gamma function, which puts solving it beyond the level of this class.

So is there a more obvious way to go about this problem, or did my prof. assign a problem that we can't actually do at this level?
1 posts omitted. Click Reply to view.
Thomas Mettingpeck - Sat, 01 Oct 2016 04:56:19 EST ID:6Tt8wvgx No.15234 Ignore Report Quick Reply
Have you tried bounding it by another function which you can prove converges?
Albert Snodman - Sun, 02 Oct 2016 16:30:45 EST ID:VNqFemsz No.15235 Ignore Report Quick Reply
I think they know that it converges but need an exact value for the intergral.
Hannah Wummerham - Wed, 05 Oct 2016 14:21:15 EST ID:QUTqUdS2 No.15236 Ignore Report Quick Reply
Yes you integrate by parts, no need for a Gamma function.
Charlotte Cunkinfoot - Fri, 07 Oct 2016 20:57:03 EST ID:q1podWFh No.15237 Ignore Report Quick Reply
I tried this. It only takes a u-substitution this way.

Also, the gamma function can be covered in a class at this level, although it isn't needed here.
Lillian Daddlekeg - Sat, 08 Oct 2016 21:13:04 EST ID:A2j/BW/W No.15240 Ignore Report Quick Reply
This. The integrand is pi*x^2*e^(-2x^3). Set u = -2x^3, the answer comes out to be pi/6.

10101011010101 by Betsy Fuckingway - Wed, 28 Sep 2016 20:51:12 EST ID:dJCwm4mq No.15225 Ignore Report Reply Quick Reply
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When u come onto the math board
Beatrice Subberbanks - Fri, 30 Sep 2016 16:50:22 EST ID:9fX9//hV No.15231 Ignore Report Quick Reply
What in the blue fuck are you talking about?
Charlotte Brezzlecheg - Fri, 30 Sep 2016 17:11:16 EST ID:ZD4TCLS2 No.15232 Ignore Report Quick Reply
I think that by posting a picture of the green vertical "code" from the movie The Matrix along with a binary string for a subject the OP is trying to indicate that they felt awed by the discussions taking place here.
Angus Blackbury - Fri, 30 Sep 2016 21:04:04 EST ID:sWygU/VW No.15233 Ignore Report Quick Reply
OP high as fuck

Basic trig question by Geraldo juarez - Tue, 13 Sep 2016 14:35:19 EST ID:wFiRC6TB No.15197 Ignore Report Reply Quick Reply
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Ok so long story short - my math teacher this semester is the wort teacher ive ever had in my entire life. Asked him what formula they used to cme up with the xy coordinates on a unit circle. Example: terminal leg of 45* aka pi/4 on the unit circle intercepts at p=(root2/2, root2/2). He said there is no formula you just have to memorize. Are you kidding me i studied the chapter over and over and realized its the pythagorean theorum no matter what the radius equals. What a shit teacher.

Anyway my question is how does sin=y, but the fundamental idenitity of sin is 1/csc? Does this mean that y=1/csc?
Part 2: can that one be interchanged with any value of r? For example does it apply for circles that are not unit circles?

I know this is super basic, and my book explains it in a complex way, but its not like i have a good enough teacher to ask any questions to fill in the holes. Ive had straight a's and b's in my previous classes up til this guy.
3 posts and 1 images omitted. Click Reply to view.
Eliza Sedgewatch - Wed, 14 Sep 2016 20:20:05 EST ID:c0vo/Lfo No.15201 Ignore Report Quick Reply
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So your problem is basically that you are in middle or high school and no one has ever taught you what a function is. Related problems include not knowing anything about set theory and having a poor grasp of English. I'm sorry but the education system sucks.

A set is a collection of things. For example, the collection containing the numbers 1, 2, and 4 is a set, which we write {1,2,4}. Sets can have anything in them, and can even be infinite, like the set of all polygons or the set of all rational numbers (fractions).

Anyway, a function from a set, say A, to another set, say B, is a correspondence which sends each thing from A to some thing in B. For example, if A is the set {1,2,3} and B is the set {4,5,6}, then we can define a function, call it f, where f(1)=4, f(2)=5, and f(3)=4.

The sine function is a function which maps real numbers to real numbers. Unfortunately it will be a very long time until you are ready to understand what a real number is, but the people in charge of teaching you are fucked beyond belief so this can't be helped.

Since the real numbers are an infnite set, we can't write down the sine function by saying what each real number gets sent to. That is, we can't write out sin(0), sin(1/32), sin(pi), ... and ever get done saying what sine is. We need a rule to define the sine function so that we know what it is we are talking about. (Knowing what you are talking about is something that most people neglect, but in math it is very important.) This rule is the one you deduced correctly even when fed garbage information. Given some real number t, the value of the sine function at t, which we write as sin(t), is defined to be the y coordinate of the point on the unit circle which intersects the line which makes angle t with the x axis. You can find videos and pictures describing this.

There is a formula for the values of the sine function in terms of addition and multiplication, but it is infinitely long and thus beyond you. The geometric definition will have to do for now.

There is another function called the cosecant function which is defined by the rule which sends t to 1/sin(t). That is the definition of csc.

I hope this helps.
Vesuvius - Sat, 17 Sep 2016 11:19:33 EST ID:9fX9//hV No.15202 Ignore Report Quick Reply
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Okay... I think this guys post is really overcomplicating everything and all while not even really answering your question. This guy could have deleted everything in his post except for :
>There is another function called the cosecant function which is defined by the rule which sends t to 1/sin(t). That is the definition of csc.

that is essentially the answer to your question which was kinda what I said in my post. Sin(y) = 1/csc(y) Because that is the definition of csc. I'm telling you man. You're professor is right. It's just the definition.
Vesuvius - Sat, 17 Sep 2016 11:24:58 EST ID:9fX9//hV No.15203 Ignore Report Quick Reply
it's like asking why do we call dogs, dogs? Because that's just what we call them.
John Bundlefoot - Sun, 18 Sep 2016 04:18:43 EST ID:9fX9//hV No.15205 Ignore Report Quick Reply
I should say the same to you.
John Bundlefoot - Sun, 18 Sep 2016 04:20:21 EST ID:9fX9//hV No.15206 Ignore Report Quick Reply
I never said I didn't understand the post. I said you were overcomplicating it. If you don't understand the difference you probably shouldn't be giving people advice about anything.

Sett theory by Graham Fingerhat - Thu, 01 Sep 2016 05:16:48 EST ID:NsqdJ6Lc No.15184 Ignore Report Reply Quick Reply
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Is there a way to find the equivalence relation corresponding to any partition?
Like p = {{1,4,7},{2,5,8},{3,6},{9}} with is an example i have in front of my nose. Can I find the relation from wich i get that partition of {1,2,3,4,5,6,7,8,9} ?
For the record I think not, but I only read about this stuff last night.
3 posts omitted. Click Reply to view.
Archie Gussleham - Sun, 04 Sep 2016 16:26:12 EST ID:d7aT3WKf No.15188 Ignore Report Quick Reply
Hahaha, great answer mr. Robot
Archie Gussleham - Sun, 04 Sep 2016 16:33:07 EST ID:d7aT3WKf No.15189 Ignore Report Quick Reply
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Charlotte Gobberhood - Tue, 06 Sep 2016 18:06:06 EST ID:4JPlB6jB No.15190 Ignore Report Quick Reply
>This is the same as having that b in P_i and a in P_i, so (b,a) in R, so the relation R is reflexive.
This should say symmetric at the end instead of reflexive.

>manually define an equivalence
Do you mean the realtion induced by a partition or something else? I'm not sure what constitutes "manually" defining a relation. Also, it's not rigorous to say that
>numbers are in the equivalence class here if they are 3 more than some other number in the equilance class
since the partition {{1,4,7},{2,5,8},{3,6,8}} also has that property and induces a different equivalence relation.
Charlotte Gobberhood - Tue, 06 Sep 2016 18:07:01 EST ID:4JPlB6jB No.15191 Ignore Report Quick Reply
This should be {{1,4,7},{2,5,8},{3,6,9}} obviously.
Nathaniel Fembledatch - Wed, 07 Sep 2016 18:46:55 EST ID:DsqbErs4 No.15193 Ignore Report Quick Reply

Oh I misread the OP, you're right. What I mean by manually defining an equivalence is to identify all the elements of one of partition sets. You could rephrase what I said by identifying the orbits of the action of adding 3 to elements of the set, with the caveat that 9 is in its own equivalence class separate from everyone else.

A Geometry(?) Question by Henry Bugglewill - Thu, 31 Mar 2016 20:43:14 EST ID:Z131bdYa No.15075 Ignore Report Reply Quick Reply
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What is the mathematical/geometric name for the shape of a peanut butter cup like this?

The best I can come up with is "crennelated truncated cone" but I feel like there's some ten-word name I could use that would very accurately describe it....
4 posts and 2 images omitted. Click Reply to view.
Charlotte Neshgold - Sun, 03 Apr 2016 23:29:07 EST ID:Z131bdYa No.15082 Ignore Report Quick Reply
That sounds super epic and all, but I'm a chemist not a mathematician :/
Cyril Dibblespear - Tue, 19 Apr 2016 05:00:58 EST ID:npKQem+e No.15095 Ignore Report Quick Reply
Fuck you, now I have gone into chocolate relapse.
Molly Suvingham - Tue, 19 Apr 2016 21:39:48 EST ID:dFkJK1jc No.15096 Ignore Report Quick Reply
should call it the Reese Cup. if anyone's qualified to name it it's us
Nell Penderfedging - Sun, 15 May 2016 20:38:08 EST ID:1eeqYqTy No.15117 Ignore Report Quick Reply
Upside down star fort.
John Funkinshaw - Thu, 25 Aug 2016 10:53:32 EST ID:n7MnP1ar No.15182 Ignore Report Quick Reply
crennelated frustum

Probability question (probably beneath most you) by Esther Dirringlore - Mon, 16 Nov 2015 07:50:43 EST ID:TdrCDJzk No.14973 Ignore Report Reply Quick Reply
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I'd appreciate it if someone could answer a probability question for me. I can't remember exactly how to work it out.

Question: How many combinations of 3As and 5Bs are there? For example, one combination would be: 'AAABBBBB' ; another would be 'ABABABBB'.
1 posts omitted. Click Reply to view.
Lillian Povingstone - Mon, 16 Nov 2015 23:18:29 EST ID:TdrCDJzk No.14975 Ignore Report Quick Reply
Yeah, if I've understood it correctly I should have said permutations. There would be 8 digits in the sequence. 3 of them would be 'A', 3 would be 'B'. So my question is, how many permutations?

8-0 1
7-1 8
6-2 28
5-3 ?
4-4 n/a
3-5 ?
2-6 28
1-7 8
0-8 1

I hope that's made it a little clearer. Thanks.
Lillian Povingstone - Tue, 17 Nov 2015 00:46:25 EST ID:TdrCDJzk No.14976 Ignore Report Quick Reply
I meant 3 would be 'A', 5 would be 'B'
Lillian Povingstone - Tue, 17 Nov 2015 01:03:27 EST ID:TdrCDJzk No.14977 Ignore Report Quick Reply
Okay. Ignore this thread. I found an online combinations calculator.
Whitey Gobbleson - Tue, 17 Nov 2015 14:30:55 EST ID:J4OUpAxW No.14978 Ignore Report Quick Reply
Magnets how do they work?
John Divingmetch - Tue, 23 Aug 2016 13:31:10 EST ID:TANb9lmN No.15181 Ignore Report Quick Reply

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