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Jan
18
accepted Laplace, Legendre, Fourier, Hankel, Mellin, Hilbert, Borel, Z…: unified treatment of transforms?
Dec
25
accepted What is the name of this construction of an induced order?
Oct
5
accepted On the identity map requirement in the definition of category
Sep
19
accepted Six object classes | products | co-products in search of a category
Sep
12
accepted Can the choice of definition of morphisms for a slice category be justified categorically?
Aug
15
accepted On pentagonal tilings
Aug
14
accepted On counting and generating all $k$-permutations of a multiset
Jul
26
accepted On the importance of natural transformations
Jul
6
accepted What's the name given to the ratio $P^2/A$ for a closed figure in the Euclidean plane?
Jul
5
accepted Looking for elementary proof of “for a circle, $C^2/A = 4 \pi$”
May
26
accepted Looking for a “Guide for the Perplexed by Low-dimensional Topology”
May
25
accepted Looking for student's guide to diagram chasing
Jan
3
accepted When is a pullback also a pushout?
Apr
7
accepted How to recognize adjointness?
Apr
5
accepted What are integrating factors, really?
Mar
16
accepted On proving $n = \sum_{d\mid n}\varphi(d)$
Mar
16
accepted On last digit of 4 consecutive primes less than 10 apart
Mar
16
accepted Is there any advantage to the $a \equiv b\;\;(\mathrm{mod}\;c)$ notation?
Mar
3
accepted Natural uses for the co-product of sets?
Feb
2
accepted Looking for counterexample where $K \not \subset H$ and $[G:K] \neq [H:H\cap K]$