User Thomas

302 votes

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Transpose of inverse vs inverse of transpose

answered Mar 25, 2013 at 0:54

122 votes

Solve $4^{9x-4} = 3^{9x-4}$

answered Oct 10, 2013 at 12:30

120 votes

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Is an irrational number odd or even?

answered May 12, 2015 at 18:57

113 votes

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Why should we prove obvious things?

answered Apr 18, 2014 at 21:53

97 votes

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What is the difference between minimum and infimum?

answered Mar 27, 2013 at 13:16

67 votes

Can someone explain Gödel's incompleteness theorems in layman terms?

answered Jul 27, 2013 at 17:09

65 votes

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What is vector division?

answered Nov 28, 2012 at 16:47

49 votes

Does $\pi$ contain all possible number combinations?

answered Oct 18, 2012 at 14:40

48 votes

What is Trinity Hall Prime number?

answered Sep 7, 2017 at 17:44

44 votes

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Find a mistake in the following bogus proof

answered Nov 10, 2016 at 14:05

39 votes

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Finding the order of permutations in $S_8$

answered Nov 6, 2012 at 3:13

32 votes

A good way to retain mathematical understanding?

answered Apr 10, 2014 at 13:04

31 votes

Infimum and supremum of the empty set

answered Jun 29, 2013 at 12:22

27 votes

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What do the symbols d/dx and dy/dx mean?

answered Mar 25, 2013 at 15:49

25 votes

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Why do you need to use the chain rule in differentiation of ln?

answered Feb 23, 2014 at 17:30

24 votes

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Uncountable minus countable set is uncountable

answered Sep 1, 2012 at 14:25

22 votes

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How do we know all numbers alternate between odd and even numbers?

answered Mar 6, 2013 at 20:19

22 votes

Why does an infinite limit not exist?

answered Apr 3, 2012 at 18:00

21 votes

Does the identity element of a group have an inverse?

answered Mar 19, 2016 at 13:11

20 votes

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What does $\mathbb{R}^n \to \mathbb{R}^m$ mean? And what is $\mathbb{R}^n$?

answered Jul 7, 2016 at 19:33

19 votes

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

answered Jul 16, 2013 at 15:12

19 votes

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If $AB=I_n$ and $BA=I_m$ then $n=m$.

answered Aug 16, 2013 at 0:14

19 votes

Why do we limit the definition of a function?

answered Mar 27, 2014 at 21:49

18 votes

Proof that $n^2 < 2^n$

answered Mar 3, 2013 at 22:53

17 votes

How exactly can't $\delta$ depend on $x$ in the definition of uniform continuity?

answered Feb 16, 2013 at 21:57

17 votes

Do mathematicians, in the end, always agree?

answered Oct 8, 2014 at 19:02

17 votes

Math without pencil and paper

answered Jun 20, 2016 at 20:07

16 votes

Do students understand infinite series before they're informally introduced?

answered Dec 12, 2012 at 14:39

16 votes

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Quantifier Notation

answered Mar 25, 2013 at 0:05

16 votes

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Don't understand the Fundamental Theorem of Calculus

answered May 19, 2015 at 23:53

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881 Answers

Transpose of inverse vs inverse of transpose

Solve $4^{9x-4} = 3^{9x-4}$

Is an irrational number odd or even?

Why should we prove obvious things?

What is the difference between minimum and infimum?

Can someone explain Gödel's incompleteness theorems in layman terms?

What is vector division?

Does $\pi$ contain all possible number combinations?

What is Trinity Hall Prime number?

Find a mistake in the following bogus proof

Finding the order of permutations in $S_8$

A good way to retain mathematical understanding?

Infimum and supremum of the empty set

What do the symbols d/dx and dy/dx mean?

Why do you need to use the chain rule in differentiation of ln?

Uncountable minus countable set is uncountable

How do we know all numbers alternate between odd and even numbers?

Why does an infinite limit not exist?

Does the identity element of a group have an inverse?

What does $\mathbb{R}^n \to \mathbb{R}^m$ mean? And what is $\mathbb{R}^n$?

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

If $AB=I_n$ and $BA=I_m$ then $n=m$.

Why do we limit the definition of a function?

Proof that $n^2 < 2^n$

How exactly can't $\delta$ depend on $x$ in the definition of uniform continuity?

Do mathematicians, in the end, always agree?

Math without pencil and paper

Do students understand infinite series before they're informally introduced?

Quantifier Notation

Don't understand the Fundamental Theorem of Calculus