24

Answers
votes newest views recent
2
Proof without words for surface area of a sphere
5
Tarski’s Theorem and Gödel’s Second Incompleteness Theorem
2
wellfounded sets and predecessors
4
Are all the theorems true?
4
existence of a field that has a non surjective ring homomorphism
2
Union of a object (a set) in the Elementary Theory of the Category of Sets
4
What is a complex inner product space “really”?
25
Can the Riemann hypothesis be undecidable?
22
What is a colimit, really?
10
Surreal Numbers and Set Theory
1
Why is the output of an LTI system the convolution of the input funtion and the impulse response?
9
Arithmetic fixed point theorem
11
Why hasn’t mereology suceeded as an alternative to set theory?
17
Montague’s Reflection Principle and Compactness Theorem
2
Confusion over a point in basic category theory
13
“Philosophical” meaning of the Yoneda Lemma
1
Compact Hausdorff and C^*-algebra “objects” in a category.
2
Can we recognize when a category is equivalent to the category of models of a first order theory?
2
Hat Problem/Hamming Codes
1
What is information-theoretic lower bound?
10
Geometric Interpretation of Trace
8
When a formal power series is a rational function in disguise
4
Is there a finitely complete category with terminal object but NO subobject classifier?
5
Why should algebraic objects have naturally associated topological spaces? (Formerly: What is a topological space?)