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Carl Mummert's user avatar
Carl Mummert's user avatar
Carl Mummert's user avatar
Carl Mummert
  • Member for 13 years, 11 months
  • Last seen more than a week ago
302 votes
Accepted

Can every proof by contradiction also be shown without contradiction?

138 votes
Accepted

Is there a known well ordering of the reals?

101 votes
Accepted

What's the difference between predicate and propositional logic?

100 votes
Accepted

Using proof by contradiction vs proof of the contrapositive

78 votes

In a family with two children, what are the chances, if one of the children is a girl, that both children are girls?

78 votes

Do We Need the Axiom of Choice for Finite Sets?

77 votes
Accepted

What is an Empty set?

75 votes
Accepted

What is the value of $1^i$?

57 votes

Why is establishing absolute consistency of ZFC impossible?

56 votes

What is a proof?

56 votes

Are "if" and "iff" interchangeable in definitions?

55 votes
Accepted

Does mathematics require axioms?

52 votes
Accepted

What's the difference between material implication and logical implication?

52 votes

What actually is a polynomial?

49 votes
Accepted

Examples of theorems that are true conceptually, but false computationally

49 votes
Accepted

$e^{e^{e^{79}}}$ and ultrafinitism

48 votes
Accepted

Is it possible to generate truly random numbers using a computer?

46 votes
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Preimage of generated $\sigma$-algebra

45 votes

How to avoid perceived circularity when defining a formal language?

45 votes

Infinite sets don't exist!?

43 votes
Accepted

Are the rationals minus a point homeomorphic to the rationals?

40 votes

What does $dx$ mean?

39 votes
Accepted

*Recursive* vs. *inductive* definition

39 votes

What is the difference between a point and a vector?

39 votes
Accepted

Why do we restrict the definition of Lebesgue Integrability?

39 votes
Accepted

$\arcsin$ written as $\sin^{-1}(x)$

39 votes
Accepted

(Why) is topology nonfirstorderizable?

39 votes

In what sense are math axioms true?

38 votes
Accepted

Does an uncountable discrete subspace of the reals exist?

38 votes

Why did mathematicians take Russell's paradox seriously?

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