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24
Answers
newest
activity
votes
2
Proof without words for surface area of a sphere
Nov 19 '12 at 1:29
5
Tarski's Theorem and Gödel's Second Incompleteness Theorem
Nov 17 '12 at 5:08
2
wellfounded sets and predecessors
Oct 4 '12 at 18:57
7
Are all the theorems true?
Aug 1 '12 at 19:17
5
existence of a field that has a non surjective ring homomorphism
May 2 '12 at 5:31
3
Union of a object (a set) in the Elementary Theory of the Category of Sets
Nov 21 '11 at 0:18
10
What is a complex inner product space “really”?
Nov 4 '11 at 8:28
44
Can the Riemann hypothesis be undecidable?
Nov 1 '11 at 7:54
22
What is a colimit, really?
Jul 28 '11 at 22:08
11
Surreal Numbers and Set Theory
Jul 21 '11 at 21:15
1
Why is the output of an LTI system the convolution of the input funtion and the impulse response?
Jun 22 '11 at 0:08
12
Arithmetic fixed point theorem
May 28 '11 at 3:25
11
Why hasn't mereology succeeded as an alternative to set theory?
May 9 '11 at 0:04
19
Montague's Reflection Principle and Compactness Theorem
Mar 19 '10 at 20:29
2
Confusion over a point in basic category theory
Feb 19 '10 at 21:24
20
“Philosophical” meaning of the Yoneda Lemma
Feb 12 '10 at 21:58
2
Hat Problem/Hamming Codes
Feb 11 '10 at 9:34
1
What is information-theoretic lower bound?
Feb 11 '10 at 3:10
3
Can we recognize when a category is equivalent to the category of models of a first order theory?
Feb 10 '10 at 20:32
1
Compact Hausdorff and C^*-algebra “objects” in a category.
Feb 10 '10 at 10:35
17
Geometric Interpretation of Trace
Feb 10 '10 at 9:42
9
When a formal power series is a rational function in disguise
Feb 10 '10 at 2:43
4
Is there a finitely complete category with terminal object but NO subobject classifier?
Feb 9 '10 at 22:20
6
Why should algebraic objects have naturally associated topological spaces? (Formerly: What is a topological space?)
Feb 9 '10 at 2:12
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