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 Mar 26 revised Deterministic finite automata (DFA) (have odd length or end with aaa) added 346 characters in body Mar 4 revised How to prove $\forall x,y\in\mathbb{R}: x^2+y^2 = (x+y)^2 \Leftrightarrow x=0\lor y=0?$ edited tags Feb 22 revised $\mathbb{Z}$ is a vector space over $\mathbb{Q}$ added 43 characters in body Feb 21 revised $\mathbb{Z}$ is a vector space over $\mathbb{Q}$ added 63 characters in body Feb 20 revised Why are matrices indexed by row first? added 490 characters in body Feb 20 revised Why are matrices indexed by row first? deleted 1 character in body Feb 16 revised Can any uncountable dimensional real vector space be made into a Banach space? shortened the title Feb 6 revised Is $0$ a natural number? added 50 characters in body Feb 6 revised Is $0$ a natural number? style Feb 6 revised Is $0$ a natural number? deleted 88 characters in body Feb 6 revised Is $0$ a natural number? deleted 1 character in body Jan 26 revised Are the polynomial functions on $S^1$ dense in $C(S^1,ℂ)$? rolled back to a previous revision Dec 18 revised If $u$ is a unit in $S$, then $u$ is a unit in $R$ deleted 2 characters in body Dec 14 revised Calculate $\:\lim_\limits{ \Large_{z \to c}}\:\:{\frac{z^n - c^n}{z-c}} ~~ c,z \in \mathbb{C}\:$ without L'Hopital's rule corrected the problem statement according to the edit Dec 11 revised What does the theory of the empty set look like? added 143 characters in body Nov 21 revised Why is the union of two closed sets again closed in the Scott topology? added 63 characters in body Nov 21 revised Why is the union of two closed sets again closed in the Scott topology? added 63 characters in body Nov 7 revised Group actions and quotient groups deleted 1 character in body Nov 7 revised Group actions and quotient groups added 65 characters in body Nov 7 revised Is there a name for a monoid with a distinguished absorbing element? deleted 181 characters in body