# 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.
T 10:08 AM dtms1

### Math Learning Materials

All math courses. PDFs, tutorials and web links.
Sep15-14 01:06 PM phion
 Meta Thread / Thread Starter Last Post Replies Views Views: 5,784 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 39,288 Hi everybody! i am trying to find out the right command to get the domain and the range of a specified function in... Mar13-12 05:11 AM IngBay 0 1,912 Hello, I have a polynomial having the form: \beta x^5 + \beta^2 x^7 + \beta^3 x^9 + \ldots =... Mar13-12 07:59 AM rasmhop 3 1,298 what is the precise definition of "parent functions" ? I know that : f(x)=x ,f(x)=x^2 , f(x)=sqr(x) , f(x)=1/x ,... Mar13-12 06:24 PM Hobin 4 2,271 This question started out as a thought experiment on a flight home from Japan a couple years ago. I've toyed with it... Mar13-12 09:07 PM scurty 1 1,071 Given the expression: e^{\sqrt{y}} What numerical operator must this expression undergo to make it so that there... Mar14-12 10:11 AM andydude 1 1,152 i know that if i am finding the order of rotations of certain element like rot(n), the order will be (2 (pi) ) / n.... Mar14-12 05:14 PM vinzz 0 891 If you laugh when reading this, you lose. :grumpy: So, I was solving a bunch of extremely easy equations, and... Mar14-12 07:42 PM Mark44 10 1,399 Im having issues with my weak algebraic skills trying to correctly re-arrange the following equation for "d" ... Mar15-12 02:49 AM tiny-tim 1 890 In the game of bridge, four players are dealt 13 cards each from a well-shuffled deck of 52 playing cards. (a)What... Mar15-12 05:28 AM tiny-tim 1 935 So here's a question for you, if on a line we chose one point, then what is the fraction of this point compared to the... Mar15-12 09:16 AM A. Bahat 3 922 Factorial Sum ( 1 2) Here is a sum from MATHCOUNTS: What are the last two digits in the sum of the factorials of the first 100 positive... Mar15-12 01:00 PM piyushon2411 20 40,478 Hi, I am writing up a project based on an algorithm for factoring large numbers, I have reached seemingly simple point... Mar15-12 05:16 PM bert2612 2 1,185 Hi everyone, I'm currently looking to solve an equation of the general form: \sqrt{x^2-y^2}+\sqrt{\epsilon... Mar16-12 01:14 AM williams99 4 892 Hi, I have been working on some Mandelbrot wallpapers for some time but have so far only visualized the whole set i.e.... Mar16-12 07:06 AM kweierstrass 2 1,020 find the area of the triangle with vertices (-1 2 -1 2) (-1 2 -1 1) and (2 -1 2 2) its 4 d Im confused thanks in... Mar16-12 12:20 PM dodo 10 2,688 A good book on Abstract Algebra that covers major undergraduate and graduate topics? Something rigorous professional... Mar16-12 05:16 PM dijkarte 5 1,110 I am trying to calculate Max CFM in a given pipe size(ranging from 1/2"- 2") at a given pressure for an ongoing... Mar16-12 06:08 PM AntnyC 0 2,308 what is the sum of the following series? I know it's convergent (using ratio test) but I'm not able to work it out :(... Mar17-12 03:23 AM ZARman 2 1,457 I am trying to calculate the standard deviation of a group of data based on a 20 period sliding window. I have run... Mar17-12 09:47 AM MrAnchovy 1 1,216 So I have this statement that I'm supposed to prove and I cannot for the life of me figure out what parts I'm allowed... Mar17-12 02:28 PM Poopsilon 2 857 Hi, Concerning only the upper right quadrant of an ellipse... I know the distance from the center of the ellipse... Mar17-12 06:08 PM JimEd 27 2,551 need hint/help or perhaps a solution :smile: Equations are from Propeller Blade Theory. I´m trying to figure out how... Mar17-12 06:24 PM D H 2 1,185 x*log(x)=0.1*x^2 Mar17-12 10:37 PM HallsofIvy 3 1,107 Hi, I need a geometric explanation for this algorithm: Suppose we have the system Ax=b, where A is and M-by-N... Mar18-12 04:33 AM S_David 0 894 Hi, I need to find the singular value decomposition (SVD) of a matrix H=H1+H2. Is this equivalent to sum the SVD... Mar18-12 08:14 AM S_David 2 727 Suppose I have a regular histogram, I can normalize it by dividing the frequency counts by the total number of counts... Mar18-12 03:37 PM mathman 1 1,905 So, I was working on computer science homework, and I decided that I would make a sequence, where there would be a... Mar18-12 09:54 PM greggory 10 1,799 Given a function, it is easy enough to plot its curve, just by substituting numerical values. But is the reverse... Mar18-12 10:41 PM NascentOxygen 1 885 With the number i, its possible to create a wave function with just one variable. example: f(x)=i^x or.. ... Mar19-12 06:08 AM johann1301 7 1,029 Hi All, So here's my question: Suppose we have two sets A and B, then A \setminus B denotes their... Mar19-12 01:13 PM azal 3 1,482 I've been meddling with prime numbers a bit with my programming studies and managed to make an ulam spiral using... Mar19-12 03:52 PM Russelluke 0 1,173 On pg 6 of http://www.scribd.com/doc/3914281/Crystal-Structure, it quotes this result without proof. My notes from uni... Mar19-12 05:37 PM RK7 3 1,265 A firm has the following total-cost and demand functions: C = aQ^3 - bQ^2 + cQ + d Q = e - P (d) Find... Mar20-12 07:44 AM NascentOxygen 1 1,338 Is this correct? A function ψ:A --> B is the set: ψ = { (x, y) | \forallx\inA\existsy\inB\ni(((x, y) \in ψ)... Mar20-12 12:22 PM SteveL27 30 2,182 I want to prove x^3 + a^2x + b^2 = 0 has one negative and two imaginary roots if b \not= 0. I know that it cannot... Mar20-12 03:35 PM emailanmol 2 1,215 A quick question... what is the resultant expression if you multiply the cubic formula by 3a, add +b and then cube the... Mar20-12 03:37 PM Frogeyedpeas 4 1,036 Here's a very interesting question:- Suppose you are given a cube and 6 different colours. You are asked to colour... Mar20-12 07:57 PM bwood01 9 1,083 I'm trying to prove something in modular arithmetic that I came upon across my studies in comp sci. Consider a set of... Mar21-12 12:17 AM chiro 4 1,183 $I\subset \reals$ $$\gamma_i:I_i\rightarrow M,\quad I_i\subset\reals,\quad i=1,2$$ $\sigma_{\alpha\beta}$ , let... Mar21-12 02:49 AM slider142 3 1,288 What mathematics did Perelman use to prove Poicare's conjecture? Do you know any guide or any book? Mar21-12 06:47 AM A. Bahat 2 1,339

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