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Apr
30
revised Looking for combinatorial identity: $\sum\limits_{j=0}^k{n \choose k-j}{m \choose j}$
typo in the name of the identity
Apr
30
suggested approved edit on Looking for combinatorial identity: $\sum\limits_{j=0}^k{n \choose k-j}{m \choose j}$
Feb
18
awarded  Teacher
Feb
18
answered Is there a common symbol for concatenating two (finite) sequences?
Jan
22
awarded  Popular Question
Jan
6
accepted Is a prime to the power of a fraction always irrational?
Jan
6
asked Is a prime to the power of a fraction always irrational?
Dec
20
awarded  Constituent
Dec
10
awarded  Excavator
Dec
9
suggested rejected edit on Notation for sequences
Dec
8
awarded  Caucus
Dec
8
accepted Does there exist a surjective homomorphism between every pair of monoids?
Dec
8
revised Does there exist a surjective homomorphism between every pair of monoids?
Add surjectivity requirement
Dec
8
comment Does there exist a surjective homomorphism between every pair of monoids?
I forgot to mention I need the homomorphism to be surjective. Updating question.
Dec
8
asked Does there exist a surjective homomorphism between every pair of monoids?
Jul
2
awarded  Curious
Jun
10
accepted What problems arise when using infinitesimals in calculus?
Jun
10
asked What problems arise when using infinitesimals in calculus?
May
23
comment Number of maximal planar subgraphs
Since there is no general exact formula, is it possible to give an upper bound?
May
23
accepted Number of maximal planar subgraphs