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Dec
9
awarded  Enlightened
Dec
9
awarded  Nice Answer
Dec
9
answered Generalized graph theory
Dec
8
awarded  Caucus
Nov
16
awarded  Mortarboard
Nov
14
awarded  Nice Answer
Nov
11
revised Open mathematical questions for which we really, really have no idea what the answer is
added 14 characters in body
Nov
11
answered Open mathematical questions for which we really, really have no idea what the answer is
Oct
23
comment What can you say about $f$ and $g$ in the case that $fg$ is 1) Injective, 2) Surjective - Cohn - Classic Algebra Page 15
Yup. If you expanded out why the statements you claim are true (especially the $x_1fg \neq x_2fg$ proof, I think I know what you are getting at but you are missing details) it would be more clear that you proved that $f$ is injective two different ways.
Oct
23
comment What can you say about $f$ and $g$ in the case that $fg$ is 1) Injective, 2) Surjective - Cohn - Classic Algebra Page 15
@Committingtoachallenge You basically have it now and adding the small change I see you added made it far more clear than it was before. Are you trying to prove injectivity two different ways? It looks like you basically have two proofs which may have also been a tad confusing.
Oct
23
revised What can you say about $f$ and $g$ in the case that $fg$ is 1) Injective, 2) Surjective - Cohn - Classic Algebra Page 15
added 6 characters in body
Oct
23
answered What can you say about $f$ and $g$ in the case that $fg$ is 1) Injective, 2) Surjective - Cohn - Classic Algebra Page 15
Oct
23
revised What can you say about $f$ and $g$ in the case that $fg$ is 1) Injective, 2) Surjective - Cohn - Classic Algebra Page 15
Number theory does not belong.
Oct
23
suggested approved edit on What can you say about $f$ and $g$ in the case that $fg$ is 1) Injective, 2) Surjective - Cohn - Classic Algebra Page 15
Oct
23
comment The behavior of quotient groups under homomorphisms
Awsome! Glad to help.
Oct
22
answered The behavior of quotient groups under homomorphisms
Aug
6
comment How “bad” can presentation of the trivial group get?
@BabakS. I don't think that would be appropriate for this particular question. I suspect that a well phrased and motivated big list question could be asked looking for interesting presentations of the trivial group, and where these presentations came from (like answered some question in topology or something), though (if it hasn't been done before).
Jul
2
awarded  Curious
Jun
4
comment Looking for a field isomorphic to $\Bbb{Q}$
Let $\alpha: \mathbb{Q} \to \mathbb{N}$ be a bijection and define operations $\times_\alpha, +_\alpha$ on $\mathbb{N}$ so that $\alpha$ is an isomorphism of fields. Your question should be more specific and well defined, otherwise I would not be surprised if your question is closed.
May
18
comment Conjecture on OEIS A167055
How high have you not disproved the conjecture?