General Math

- Math topics not applicable to the categories below. High-school Math

Math FAQ

Jul24-14 10:02 AM Greg Bernhardt

Math Challenges

Test your skills. Math challenges will be posted at least once a week. Suggestions for problems are welcomed.
 Meta Thread / Thread Starter Last Post Replies Views Views: 426 Announcement: Follow us on social media and spread the word about PF! Jan16-12 Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions... Feb23-13 09:23 AM micromass 1 38,817 What are the signs that one should show when one is not enjoying a particular area of maths? In other words how can... May20-09 11:27 PM AUMathTutor 5 1,069 I've already posted a couple of index notation questions on here and I've gotten very helpful responses. So I thought... Apr17-09 01:37 PM Will_taylor22 12 1,484 I have a general question about index notation. For an arbitrary quantity, a, "a" denotes a scalar quantity.... Aug25-09 10:11 AM CFDFEAGURU 3 1,651 Hello world, Index notation is driving me crazy: why on Earth is ∂_i 1/r = -x_i/r^3 ? I would expect it to... May12-12 05:15 AM ellocomateo 2 812 The colimit is defined in terms of a functor from an indexing category to another category(a diagram). In the... Nov10-09 08:11 PM Hurkyl 1 676 I am sure that x^{\infty} as x\to1 is an indeterminate form. But can someone please explain how 1^{\infty} is... May10-12 06:57 AM Infinitum 2 785 Hi, I am attempting a logistic regression analysis with a binary response and explanatory variables measured at the... Jan10-10 03:17 AM wvguy8258 0 1,013 What is an independent variable. Is that what you have to solve for? Like for example in the problem; y^2 = x -... Jul19-04 06:52 AM HallsofIvy 7 5,680 I'm in grade 11 and I have to do an independent study on Logarithms. I need a problem or puzzle that I will solve... Oct5-04 04:10 PM TheShapeOfTime 5 1,329 I have done well in undergraduate mathematics, and would like to do some self study in something more advanced and... Oct6-11 08:32 PM 1mmorta1 3 934 I'm studying the Poisson Process (rate R) and I'm hung up on the issue of dependence. This seems like and easy... Oct10-10 05:56 PM CRGreathouse 1 1,629 \!$$∫x^2/Sqrt \x$$ I need to find the integral of (x^2)/ Sqrt(1-(x^2)) if the above doesnt work properly... Apr6-05 11:39 PM Data 6 1,078 Well, this is an embarrassingly elementary question, but in my lecture slides (for an electrical engineering course,... Apr13-05 08:55 AM dextercioby 4 3,479 I know this is a simple question but I can't exactly figure out the logic governing this problem, I just know it had... May9-12 02:11 PM Stephen Tashi 12 1,141 Hey all Is there a clever, and elegant way to change a sinc^2 function so that its side lobes will be larger? Jan9-14 12:36 AM maajdl 1 446 Hi I know about calculus, but what other mathematical methods can be used to increase profit? Thanks Sep12-09 08:15 AM ojsimon 2 689 Construct a plane containing N points, no three of which are collinear. Calculate the n distinct ways they can be... Aug17-03 01:46 AM Loren Booda 0 1,044 Wikipedia does a pretty good job at explaining how different calculators treat percentage differently. For example... Aug2-11 07:07 PM dalcde 18 2,304 i liked the posts i read about how some people here learned calculus at a young age, so here i don't feel as isolated... Jan9-07 05:57 PM chroot 6 1,481 For example, when a proton and an anti-proton collide, they cancel each other out. They become neutral. However when... Apr26-12 04:35 AM JJacquelin 17 2,139 The proof of Gödel's Incompleteness Theorem is so simple, and so sneaky, that it is almost embarassing to relate. His... Apr8-06 04:48 PM gravenewworld 3 1,658 Can someone prove to me why computable numbers are not closed under the taking of suprema? Jun8-09 04:26 PM Dragonfall 14 1,390 Am I right about this - Inclusive - This basically means that suppose in the interval - x – y The range... Sep22-09 01:39 AM dE_logics 6 8,983 If I am given data for four sets and am asked to find how many elements are in exactly two of these four sets, how... Apr22-04 03:04 PM matt grime 3 4,068 what are the coordinates of incentre of a triangle if the three vertices are (a1,b1),(a2,b2),(a3,b3)? May13-11 10:34 AM micromass 1 2,032 I know that the gamma function (from 0 to infinity): \int e-t tx-1 dt = \Gamma(x) and that the relation exists...... Jan11-11 01:08 PM badtwistoffate 0 607 Hi Everyone, I am looking for some help on this question In Triangle EFG find the value of f, if e=7.3cm g=8.7cm... Aug14-11 09:30 PM dalcde 1 1,216 While responding to another thread about summing nth powers of integers, I came up with what might be a new method.... Oct18-05 01:38 AM shmoe 5 860 In the derivation of a cycloid, it says (pg. 655 Stewart, 5th ed) |OT| = \text{arc} \ PT = r \theta . I was just... Sep28-07 06:46 AM HallsofIvy 4 1,684 in the following i will demonstrate a 'proof' that 1+1=0 1+1=√1 +1 =√(-1)(-1) +1 = (√(-1))(√(-1)) +1 ... Feb20-14 12:09 PM Integral 25 1,155 In the bionomial expansion (1+x)^p , p can be integer or fraction. The coefficients are written as p ... Jul11-10 09:10 AM CRGreathouse 2 942 Whyyyyyy??! Whhhhhy?!!!? May12-11 06:47 AM gikiian 6 6,084 In science proving something by making it linear is a cmmon approach. For instance you can write some laws on this... Feb10-07 06:00 AM D H 4 924 Hello all, I'm in the process of working on developing a course to prepare students for calculus. The emphasis is... Feb11-09 01:34 PM Tac-Tics 3 1,168 Long story short, I've been looking for a program that can produce graphs like mathematica and manipulate 3D objects... Mar8-11 10:01 PM danzibr 0 1,230 1) in my exams there were 3 simple questions on integration carrying 5 marks each, i solved them correctly but the... May18-10 02:37 AM sachin_naik04 11 1,924 Dear all, i'm trying to understand geometry by studying the subject myself. i came across idea that i'm very much... Jul31-13 07:47 PM mafendee 2 3,911 what in the world does this mean: http://mathworld.wolfram.com/BilinearFormKernel.html Is this algebra 2? Apr24-04 08:29 AM honestrosewater 21 1,943 ? ? Aug21-08 05:26 PM coverband 2 1,487 Hello everyone A question in complex numbers If inflicted P = q par There is a point of equality:... Oct5-07 02:27 PM m_s_a 0 919