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7h
revised Primary structures in $\mathbb Q$
typo
7h
comment Primary structures in $\mathbb Q$
@EmilJeřábek, thank you for answering my just in case questions. For the sake of the completeness of the thread you may still enter your text as an Answer, including your observation about the maximality of the primary structures. Question Q2 is still the key.
1d
revised Primary structures in $\mathbb Q$
1-line intro
1d
revised Primary structures in $\mathbb Q$
a math typo
1d
revised Primary structures in $\mathbb Q$
a trivial typo
1d
answered Primary structures in $\mathbb Q$
1d
revised Primary structures in $\mathbb Q$
triviality (same sense)
1d
comment Primary structures in $\mathbb Q$
@EmilJeřábek, thank you for pointing to my typos. I've fixed them by now. It was not just $\ S\ $ but the induced multiplicative monoid $\ S^*;\ $ and it was also supposed to be an additive semigroup -- not an additive monoid. Sorry for the typos.
1d
revised Primary structures in $\mathbb Q$
Typo! Bad :-)
1d
revised Primary structures in $\mathbb Q$
italic
1d
revised Primary structures in $\mathbb Q$
typo
1d
comment Primary structures in $\mathbb Q$
I could add examples of u.d.p. sequences for which it is not obvious that they are not additive monoids (i.e. that they are not primary structures). The QUESTION is already a bit long but I could do it.
1d
asked Primary structures in $\mathbb Q$
Feb
6
comment What (fun) results in graph theory should undergraduates learn?
@FedorPetrov, perhaps you are right but then we need a separate sub-forum for such questions.
Feb
4
revised natural radical and an algebraic expression in $\pi$ and/or $e$
parentheses
Feb
4
revised natural radical and an algebraic expression in $\pi$ and/or $e$
LaTeX
Feb
4
revised natural radical and an algebraic expression in $\pi$ and/or $e$
typos
Feb
3
comment natural radical and an algebraic expression in $\pi$ and/or $e$
@Wojowu, thank you. (About the "need"--I can't help it :-).
Feb
3
comment natural radical and an algebraic expression in $\pi$ and/or $e$
Great @Wojowu, thank you, what a relief! May I absorb your super-step into the Addendum to the "QUESTION"? (I'd credit you, but of course).
Feb
3
revised natural radical and an algebraic expression in $\pi$ and/or $e$
a typo