# 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.

### 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: 5,005 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 39,241 How do i show that the inequality |x-3| >= |x|-|3| holds for any x contained in R (real values). and in the... Mar22-04 03:03 AM arildno 5 1,314 Hi, I would appreciate some ideas on the following problem: We are given the inequality: (1) |a| + |b| >=... Oct4-04 11:23 AM uart 2 1,017 I've been making up problems to practice with, and I came across something I couldn't tell on my own, and that is, how... Jul28-12 02:35 PM arildno 4 871 Are the less than (<) and greater than(>) relations applicable among complex numbers? By complex numbers I don't mean... May5-14 05:33 AM jbriggs444 1 384 Hey! I have this: 2(√(1-a^2 ))+ 2a How to determine the maximum value of this? I think good for this is Inequality... Jan13-13 02:47 AM Numeriprimi 5 723 hello all: I have tried to solved the following problem, however, I was stucked. thanks for the help: x, y z are... May21-05 07:16 AM Vivek Sharma 10 3,296 If abc=1 prove 1/3(b+c)] + 1/3(a+c)] + 1/3(b+a)] >= 3/2 where a, b, c are positive real numbers. Please give me... Jun19-08 04:09 AM redmafiya 21 3,068 In this link is a part of a book on approximations of functions. ... Oct31-11 02:53 PM Stephen Tashi 5 1,545 It struck me when reading about the axioms of inequalities, that this inequality wasnt that easy to straight ahead... May17-08 07:49 AM Kurret 0 1,157 Any help/hints for the following inequality? (a + b) (a + c) (b + c) (a + d) (b + d) (c + d) >= 4 a b c d (a + b +... Jun17-08 11:09 PM LanNguyen 0 1,085 Hello folks :smile: I always thought that inequalities could be treated exactly like equations but somehow I seem... Feb1-12 09:39 PM Saladsamurai 25 3,649 hiii, i was wondering if anybody knew how to help me with this one tricky homework question. i can do most of the... Aug29-11 05:06 AM J-Girl 5 1,318 I am having trouble solving these type of problems for some reason. I cant get to the answer. If anyone could care to... Dec20-05 09:28 PM uart 7 6,090 When I was working on a rather difficult real-life math problem, I nearly found the solution. What I came up with was... Feb18-13 03:22 PM Chelonian 0 458 I was considering complex numbers (independently) and I came across an interesting question. Are any of these... Apr3-10 08:17 AM HallsofIvy 3 2,971 referring to the photo attached, can anyone expalin and give suitable numerical example please? i couldnt understand... May22-14 07:58 AM micromass 1 290 I have no idea how to solve this inequality without using AM-GM inequality: for any positive integers p,q,x,y... May5-10 06:47 PM mathman 2 1,013 stupid error in the "tex" thing, see first post. Jul1-07 12:35 PM Trail_Builder 7 1,411 So i have an equation to calculate the impossibility of pair production during photon decay into two electrons and I'm... Apr10-14 08:39 AM HallsofIvy 1 401 Check this out: 1 < 2 \Rightarrow \frac{1}{4} < \frac{1}{2} \Rightarrow (\frac{1}{2})^2 < \frac{1}{2} ... Jun3-09 04:56 PM Psyborg 9 11,564 Hello all! :smile: In my quest to re-teach myself the basics of mathematics in a more rigorous fashion, I have found... Feb13-12 09:23 PM micromass 5 1,698 friends help on this, Use the ineequalities 1+x<=e^x<=1/1-x for |x|<1 to show that lim(e^x-1)/x = x-0+... Mar10-05 10:49 AM arildno 2 1,001 Considering that the truth of Si implies the truth of Si+1, i ε natural numbers, then starting from the truth of S1,... Nov15-11 12:14 PM Stephen Tashi 3 1,252 I'm stuck and not sure what I've done wrong for this problem Prove the following by mathematical induction: 1^3 +... Mar12-04 06:44 AM HallsofIvy 2 1,504 Hi, I need to prove the following: 1+ \frac{ 1}{ 2!} + \frac{1 }{3!} +...+ \frac{ 1}{ n!} < 2 \lbrack 1 - (... Feb26-07 08:11 AM Bazman 2 937 Hello. In the Wiki entry for "Leibniz harmonic triangle" there one can find a formula L(r, c) = 1/(c * binom(r -... Oct16-10 10:10 AM awkward 1 2,802 Any suggestions on how to simplify the log (m+1) terms that arise when proving the following statement using induction... Sep2-10 04:57 AM Petr Mugver 1 1,326 What is wrong with this inductive proof that all protrons have the same mass? 1. if you have one protron then it... Oct6-08 03:35 AM dodo 5 1,178 To prove: (1 + 2 + 4 + . . . + 2^{n}) + 1 = 2^{n+1} , ∀n ≥ 0 . Basis Step n = 0: LEFT HAND SIDE: (2^{0})+ 1 = 1... May1-13 05:20 AM mfb 1 533 Here it is, tell me who is wrong... A definition of Induction and Deduction in a general science field: ... Sep7-06 07:40 PM Swapnil 43 13,959 If I am given a propisition P(m,n) and asked to show that it is true for all integers m and n, how do I go about that?... Jun19-09 05:39 PM Dragonfall 1 1,995 Is it possible to induce on Q+ by showing that a statement is true for n=1 and (n/m=>(n+1)/m AND n/m=>n/(m+1))? Dec24-05 05:13 AM matt grime 5 1,505 I'm just wondering how induction can be used to show the following: (A_1 \bigcup A_2 \bigcup A_3 \bigcup \cdots... Jan15-08 03:40 PM mathman 2 2,685 Hi there, Im having some problems with figuring out these two questions I have been given out for homework. Both of... Nov14-06 01:51 AM tuananh 7 1,404 Need to Prove \displaystyle\ (\frac{n+1}{2})^n \geq n! -(a) It can be easily proven using AM-GM inequality..... Jul6-10 08:53 AM dr hannibal 0 595 I came across this proof in Spivak that appears to use complete (strong) induction. He is trying to argue that a set A... Oct26-08 04:14 PM mathwonk 3 3,876 Hello I am doing some research on non-linear systems, and have come across a equation regarding inductance and I am... Jan7-06 10:11 AM Jimbo 1 1,168 Something I have been curious about, but never had the time to think about is, I know that; x^{3/2} = \sqrt{x^{3}}... Jun1-06 04:14 AM Hootenanny 7 1,258 Is there an equivalent notation to Capital Pi notation (multiplier) and Sigma notation (summer) for raising to the... May11-13 07:56 PM Simon Bridge 1 546 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 1,082

Display Options for General Math Mentors
Showing threads 8361 to 8400 of 15322 Mentors : 2
 Sorted By Thread Title Last Post Time Thread Start Time Number of Replies Number of Views Thread Starter Thread Rating Sort Order Ascending Descending From The Last Day Last 2 Days Last Week Last 10 Days Last 2 Weeks Last Month Last 45 Days Last 2 Months Last 75 Days Last 100 Days Last Year Beginning
 Forum Tools Search this Forum Search this Forum :   Advanced Search