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An amateur general topology researcher.


19h
accepted A trigonometric equality
23h
comment A trigonometric equality
The last implication seems wrong. And it is not quite clear how the answer follows from the last equality
23h
comment A trigonometric equality
"simplify cotan arccos(y/sqrt(y^2+x))" at Wolfram Alpha suggests that my equality is true
1d
asked A trigonometric equality
1d
asked An error in Wikipedia? (trigonometry)
Apr
15
accepted Splitting Frechet filter into two proper filters
Apr
15
asked Splitting Frechet filter into two proper filters
Apr
15
asked Going down from filters to sets for specific relations
Apr
14
comment Certain constructs on filters and on principal filters
Now after some investigations, I strongly suspect that both conjectures are false. However I do not know a counterexample.
Apr
14
revised Certain constructs on filters and on principal filters
added 173 characters in body
Apr
14
revised Certain constructs on filters and on principal filters
added 11 characters in body
Apr
14
revised Certain constructs on filters and on principal filters
added 11 characters in body
Apr
14
revised Certain constructs on filters and on principal filters
added 7 characters in body
Apr
14
asked Certain constructs on filters and on principal filters
Apr
13
comment Write theorem conditions concisely
Please also assist in constructing a proof of such a theorem from implications of the above mentioned predicates.
Apr
13
revised Write theorem conditions concisely
edited tags
Apr
13
asked Write theorem conditions concisely
Apr
9
answered An indexed family of filters and their elements
Apr
9
asked An indexed family of filters and their elements
Apr
3
comment An other question about filters and ultrafilters
@Apostolos: I mean that is not implied for every $\mathcal{L}$