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University of Florence


1d
comment Number of different snake orientations
I'm not sure they are the same thing but they are not simply "polyominos" but "directed snake polyominos". See also: arxiv.org/pdf/1307.8432v2.pdf
1d
comment Number of different snake orientations
See oeis.org/A182644
Jan
23
revised Find the volume of the set.
added 439 characters in body
Jan
23
answered Find the volume of the set.
Jan
23
awarded  Yearling
Jan
21
revised Finding matrix exponential
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Jan
21
awarded  Nice Answer
Jan
21
revised Finding matrix exponential
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Jan
21
revised Finding matrix exponential
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Jan
21
revised Finding matrix exponential
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Jan
21
answered Finding matrix exponential
Jan
18
answered Attempt to proof the Cantor-Bernstein theorem
Jan
18
comment Attempt to proof the Cantor-Bernstein theorem
What you write makes little sense... $f_M^{-1}(N) = M$. Maybe you mean $f_M(M)$? You should correct your question...
Jan
10
comment Is $0$ a natural number?
@AsafKaragila I agree.
Jan
9
comment Is $0$ a natural number?
@AsafKaragila I agree with you. But I think (please confirm) that in every country a child is taught to attach numbers to things (i.e. counting) starting from 1. I think that also mathematicians do that: Problem #1 is the first problem in the list. In my experience only computer scientists do count from zero and only when talking with computers or other computer scientists...
Jan
8
answered Is $0$ a natural number?
Jan
8
revised Why do some accept zero as a natural number but others don't?
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Jan
8
revised Why do some accept zero as a natural number but others don't?
added 1149 characters in body
Jan
8
revised Why do some accept zero as a natural number but others don't?
added 4 characters in body
Jan
7
answered Why do some accept zero as a natural number but others don't?