agent154
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 Sep 20 comment Prove that $(\mathbb{R}\setminus \{0\},\sim):= ab>0$ is transitive. Ah. For whatever reason I had not considered multiplying them together. I had thought of dividing them out, but was getting nowhere that way. Sep 20 asked Prove that $(\mathbb{R}\setminus \{0\},\sim):= ab>0$ is transitive. Sep 19 asked How do I prove that a multi-part function is injective and/or surjective? Sep 19 accepted Show that $A\setminus (B\setminus C)=(A\setminus B)\cup(A\cap B\cap C)$ Sep 19 comment Show that $A\setminus (B\setminus C)=(A\setminus B)\cup(A\cap B\cap C)$ I vaguely recall this from some years ago -- what is this property/equality/law called? I'm referring to the addition of $B$ and $\overline{B}$ to both sides of a union Sep 19 asked Show that $A\setminus (B\setminus C)=(A\setminus B)\cup(A\cap B\cap C)$ Sep 16 awarded Popular Question Sep 9 awarded Popular Question Sep 8 awarded Yearling Aug 5 awarded Famous Question May 28 awarded Notable Question May 23 awarded Popular Question Apr 26 awarded Notable Question Apr 23 awarded Notable Question Apr 23 awarded Famous Question Apr 19 awarded Popular Question Apr 16 awarded Famous Question Apr 3 awarded Popular Question Mar 28 awarded Notable Question Mar 16 awarded Popular Question