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1d
comment A number theory problem.
Welcome to Maths.SE! Please, try to make the title of your questions more informative. E.g., Why does $a\le b$ imply $a+c\le b+c$? is much more useful for other users than A question about inequality. For more information on choosing a good title, see this post.
1d
reviewed Close A number theory problem.
Jul
26
answered What is usually understood as DOMAIN and CODOMAIN of a Relation
Jul
26
reviewed Close Limit approach to infinity
Jul
26
reviewed Close What is the definiton for “best probability measure”?
Jul
26
reviewed Close Is it always possible to converge from an integer to another integer?
Jul
26
revised Prove that if $a<1/a<b<1/b$ then $a<-1$
deleted 15 characters in body; edited tags; edited title
Jul
15
comment Does $2$ belong to $\{1, \{2, \{3\}\}\}$?
Welcome to Maths.SE! Please, try to make the title of your questions more informative. E.g., Why does $a\le b$ imply $a+c\le b+c$? is much more useful for other users than A question about inequality. For more information on choosing a good title, see this post.
Jul
15
revised Does $2$ belong to $\{1, \{2, \{3\}\}\}$?
added 3 characters in body; edited title
Jul
15
revised Solving $3x^3\equiv 7\pmod{925}$
added 2 characters in body
Jul
13
reviewed Reopen The Big-$\mathcal{O}$ notation
Jul
5
answered Using elementary set theory to show the union of two sets is equal to the set difference of two sets
Jul
4
answered Coproduct of rooted posets
Jun
26
revised Circles in circle
edited tags
Jun
25
comment Dually Dedekind Set and Weakly Dedekind set
This is the right idea, but is it right to speak about "orbit" when the function is not injective? I don't think I have seen the terminology in this case.
Jun
25
comment Dually Dedekind Set and Weakly Dedekind set
Please do not ask multiple questions at once. This makes your question unlikely to be of help for future readers (who are unlikely to have trouble with precisely the same set of questions), and also harder to answer all of them in satisfying detail.
Jun
25
answered Semi-partition or pre-partition
Jun
25
answered The recursion principle.
Jun
24
revised How do I notate this statement about a state of affairs (similar to a possible world)?
added 9 characters in body
Jun
24
answered How do I notate this statement about a state of affairs (similar to a possible world)?