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davidlowryduda
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  • Member for 11 years, 1 month
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160 votes

Why is the inverse of a sum of matrices not the sum of their inverses?

111 votes
Accepted

What are the numbers before and after the decimal point referred to in mathematics?

107 votes

Why is it hard to prove whether $\pi+e$ is an irrational number?

95 votes
Accepted

The expected payoff of a dice game

68 votes

Is it unheard of to say that you like math but hate proofs?

65 votes
Accepted

How does an exponent work when it's less than one?

58 votes

How is $e^x$ read aloud?

58 votes
Accepted

How many circles are needed to cover a rectangle?

56 votes

When should an equation be numbered when writing a paper?

54 votes
Accepted

Why does positive definite matrix have strictly positive eigenvalue?

52 votes
Accepted

Why is n mod 0 undefined?

52 votes
Accepted

Is learning (theoretical) physics useful/important for a mathematician?

52 votes

Why does the series $\sum_{n=1}^\infty\frac1n$ not converge?

47 votes

Proof $1+2+3+4+\cdots+n = \frac{n\times(n+1)}2$

44 votes

What is difference between a ring and a field?

40 votes
Accepted

How to force prime numbers into a line?

37 votes
Accepted

What exactly *is* the Riemann zeta function?

34 votes
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Why can't we define more elementary functions?

33 votes
Accepted

Motivation behind the definition of a Manifold.

32 votes
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Proof that $\pi$ is rational

30 votes
Accepted

How to understand and appreciate the prime number industry?

29 votes

How can one talk about gcd in the context of complex numbers where order doesn't exist?

28 votes
Accepted

Is $ \sqrt{2000!+1}$ a rational number?

27 votes

Pigeonhole principle: Five points on an orange

25 votes
Accepted

Why is it called a 'ring', why is it called a 'field'?

25 votes
Accepted

Squares in arithmetic progression

25 votes
Accepted

Are there any special rules when making a substitution in an integral?

25 votes
Accepted

What is the purpose of the $\mp$ symbol in mathematical usage?

25 votes

The shortest distance between any two distinct points is the line segment joining them.How can I see why this is true?

24 votes

Math without infinity

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