chubbycantorset

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31 Questions

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34	Is it possible to prove a mathematical statement by proving that a proof exists?
12	Are $\mathbb{R}$ and $\mathbb{Q}$ the only nontrivial subfields of $\mathbb{R}$?
5	Do properties of algebraic structures sometimes not carry over when their direct products are taken?
5	Is it possible to learn ring theory if one's familiar, but not good at group theory?
5	Prove that the group isomorphism $\mathbb{Z}^m \cong \mathbb{Z}^n$ implies that $m = n$

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722 Reputation

+10	Is it possible to prove a mathematical statement by proving that a proof exists?
-2	Prove that T is a subring of R
+5	How can I show that $n_p(A )\cdot n_p(B) = n_p(A \times B)$?
+5	How can one find Jordan forms, given the characteristic and minimal polynomials?

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10 Answers

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2	Cardinality of an infinite set minus an infinite subset
1	proof of that a continuous function has a fixed point
1	Simple problems that can be carried around in your head
1	Are these two venn diagrams valid for $(A-B)\cup (B\cap C)$?
1	Proving that $f(n)=n$ if $f(n+1)>f(f(n))$

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33 Tags

3 elementary-set-theory × 3	1 analysis
1 real-analysis × 4	1 big-list
1 continuity × 2	1 reference-request
1 calculus	1 arithmetic
1 functional-equations	0 group-theory × 15

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