User dtldarek

174 votes

Accepted

Do two right triangles with the same length hypotenuse have the same area?

answered Jul 30, 2013 at 22:22

118 votes

Accepted

Four color theorem disproof?

graph-theory coloring planar-graphs

answered Nov 2, 2016 at 6:33

107 votes

How to convince a math teacher of this simple and obvious fact?

algebra-precalculus arithmetic education

answered Jul 16, 2013 at 10:10

74 votes

Can two integer polynomials touch in an irrational point?

geometry polynomials examples-counterexamples irrational-numbers

answered Oct 14, 2016 at 13:02

72 votes

Proving :$\arctan(1)+\arctan(2)+ \arctan(3)=\pi$

trigonometry

answered Jan 7, 2013 at 16:37

62 votes

Accepted

How do I motivate myself to do math again?

soft-question advice

answered Oct 17, 2013 at 7:53

36 votes

How important is programming for mathematicians?

soft-question

answered Apr 15, 2012 at 14:06

34 votes

Accepted

Does "This is a lie" prove the insufficiency of binary logic?

logic

answered Mar 13, 2012 at 12:26

31 votes

How much Math do you REALLY do in your job?

soft-question career-development

answered Jan 29, 2013 at 15:42

30 votes

Notation for "is divisible by"

elementary-number-theory notation divisibility

answered Apr 22, 2012 at 13:15

30 votes

Accepted

A example of closed and bounded does not imply compactnesss in metric Space

real-analysis metric-spaces compactness

answered Mar 29, 2013 at 1:54

30 votes

Why we use the word 'compact' for compact spaces?

soft-question terminology compactness

answered Jun 22, 2015 at 14:18

28 votes

Can't argue with success? Looking for "bad math" that "gets away with it"

examples-counterexamples big-list

answered Dec 17, 2012 at 13:32

27 votes

Fractions in binary?

number-systems binary

answered Feb 12, 2013 at 18:50

27 votes

Proving that the maximum of two convex functions is also convex

calculus

answered May 20, 2012 at 18:23

24 votes

Do De Morgan's laws hold in propositional intuitionistic logic?

logic propositional-calculus constructive-mathematics

answered Mar 14, 2012 at 19:29

24 votes

Why Peirce's law implies law of excluded middle?

logic propositional-calculus

answered Jul 19, 2013 at 8:03

23 votes

Markov process vs. markov chain vs. random process vs. stochastic process vs. collection of random variables

stochastic-processes random markov-chains markov-process

answered Dec 28, 2012 at 0:36

22 votes

Accepted

Difference : subsequences and substrings

combinatorics

answered Apr 16, 2015 at 7:52

19 votes

Is it possible to put an equilateral triangle onto a square grid so that all the vertices are in corners?

geometry euclidean-geometry analytic-geometry

answered Jul 14, 2015 at 9:44

18 votes

Motivation for spectral graph theory.

linear-algebra graph-theory intuition spectral-graph-theory motivation

answered Feb 20, 2013 at 12:03

18 votes

Is there a mathematical symbol for "For every element"?

notation

answered Jun 19, 2012 at 15:22

18 votes

Accepted

What is this property called for a function? $f(f(x))=f(x)$

functions terminology function-and-relation-composition

answered Feb 17, 2015 at 22:44

17 votes

How many real roots does $(x-a)^3+(x-b)^3+(x-c)^3$ have?

polynomials

answered Jul 16, 2013 at 8:37

17 votes

Accepted

Total unimodularity of matrix with consecutive ones property

linear-algebra matrices

answered Feb 25, 2014 at 10:15

17 votes

Accepted

Find the maximum possible area of a certain right triangle

geometry inequality optimization

answered Jun 24, 2015 at 15:58

16 votes

Intuitive definitions of the Orbit and the Stabilizer

abstract-algebra group-theory group-actions

answered Dec 7, 2012 at 18:11

16 votes

Accepted

Prove $\sqrt{a} + \sqrt{b} + \sqrt{c} \ge ab + bc + ca$

inequality proof-writing radicals a.m.-g.m.-inequality tangent-line-method

answered Mar 20, 2013 at 23:56

16 votes

Accepted

Intersection of two deterministic finite automata?

computer-science automata formal-languages regular-language

answered May 20, 2012 at 19:01

16 votes

What is a false premise?

logic propositional-calculus

answered May 21, 2014 at 14:45

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981 Answers

Do two right triangles with the same length hypotenuse have the same area?

Four color theorem disproof?

How to convince a math teacher of this simple and obvious fact?

Can two integer polynomials touch in an irrational point?

Proving :$\arctan(1)+\arctan(2)+ \arctan(3)=\pi$

How do I motivate myself to do math again?

How important is programming for mathematicians?

Does "This is a lie" prove the insufficiency of binary logic?

How much Math do you REALLY do in your job?

Notation for "is divisible by"

A example of closed and bounded does not imply compactnesss in metric Space

Why we use the word 'compact' for compact spaces?

Can't argue with success? Looking for "bad math" that "gets away with it"

Fractions in binary?

Proving that the maximum of two convex functions is also convex

Do De Morgan's laws hold in propositional intuitionistic logic?

Why Peirce's law implies law of excluded middle?

Markov process vs. markov chain vs. random process vs. stochastic process vs. collection of random variables

Difference : subsequences and substrings

Is it possible to put an equilateral triangle onto a square grid so that all the vertices are in corners?

Motivation for spectral graph theory.

Is there a mathematical symbol for "For every element"?

What is this property called for a function? $f(f(x))=f(x)$

How many real roots does $(x-a)^3+(x-b)^3+(x-c)^3$ have?

Total unimodularity of matrix with consecutive ones property

Find the maximum possible area of a certain right triangle

Intuitive definitions of the Orbit and the Stabilizer

Prove $\sqrt{a} + \sqrt{b} + \sqrt{c} \ge ab + bc + ca$

Intersection of two deterministic finite automata?

What is a false premise?