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 Oct 8 awarded Notable Question Jul 21 awarded Popular Question Dec 17 awarded Caucus Dec 14 awarded Yearling Oct 21 awarded Notable Question Sep 24 awarded Autobiographer Jul 2 awarded Curious Apr 5 awarded Popular Question Jan 24 awarded Popular Question May 6 revised Is $R_K$ first countable? Edited title. May 6 suggested approved edit on Is $R_K$ first countable? Apr 30 accepted Proof by Induction solution not understood Apr 30 comment Proof by Induction solution not understood Thanks. What about this part? $(3m + 1)(3m + 2)(3m + 3)≤(3m + 3)^3 = 27(m + 1)^3$ Apr 30 awarded Citizen Patrol Apr 30 asked Proof by Induction solution not understood Apr 26 awarded Organizer Apr 26 revised Orthogonality & Adjoint Operator Added homework tag Apr 26 suggested approved edit on Orthogonality & Adjoint Operator Apr 22 comment Injection / Surjection I totally get that now. Thanks! Apr 22 comment Injection / Surjection @vadim123 Well yes, but I don't know if it's injective or not at the start. The goal is to find out. So 4 & -4 are both elements of A, right? And they can't both be mapped to the same element in B, making the function NOT injective, right?