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Feb
1
awarded  Nice Answer
Jan
20
awarded  Nice Answer
Jan
16
comment Any subspace of connected set is connected?
some consider $\emptyset$ to be not connected, nor disconnected, much like the status of $1$ and primality. The reason is that some theorem become a bit cleaner to state (e.g., a space is then the union of connected subspaces, uniquely up to an ordering of the subspaces).
Jan
14
awarded  Nice Answer
Jan
13
answered Trouble understanding Borel sets definition
Jan
12
comment Notions of groups acting on groups
Thanks @Thomas for the very clear answer.
Jan
9
asked Notions of groups acting on groups
Jan
4
comment Vector space that can be made into a Banach space but not a Hilbert space
ah, I understand your question now.
Jan
4
comment Vector space that can be made into a Banach space but not a Hilbert space
Which norms on $\mathbb R^n$ do you know? Every heard of the $\ell_p$ norm? If $p\ne 2$, then its not coming from an inner product.
Jan
4
comment How to pronounce mathematical words correclty
I would say that such questions do belong on this site.
Jan
4
answered Categorifiying Implication
Dec
25
answered The complement of a first category set in X is a set of second category.
Dec
21
comment Computer Science in mathematical setting
thansk @DavidRicherby I added 'complexity'
Dec
21
revised Computer Science in mathematical setting
added 15 characters in body
Dec
18
answered complex analysis, connected set,
Dec
18
revised Why don't we define “imaginary” numbers for every “impossibility”?
added 1 character in body
Dec
14
awarded  Nice Answer
Dec
3
comment Noncyclic group has at least 5 subgroup
corrected. Thanks to both of you.
Dec
3
revised Noncyclic group has at least 5 subgroup
deleted 343 characters in body
Dec
3
answered Noncyclic group has at least 5 subgroup