Carlos Eugenio Thompson Pinzón
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 Oct 7 awarded Yearling Feb 11 comment How do you define the derivative of a function without an argument? @GitGud, I know. My point is that $f'$ is just the function generated by point-wise calculating $f'(x)$ in each point $x$. At least whenever $f$ is derivable in $x$. I might further declare a derivate operator but that does not define the derivative of a function. Feb 11 comment How do you define the derivative of a function without an argument? $f':\mathbb R\to\mathbb R$, $x\mapsto f'(x):=\lim_{h\to 0}\frac{f(x+h)-f(x)}{h}$ Feb 1 comment what can we say about $f(x)= |\cos x| + |\sin x|$ Note that if 4 is true, then 2 is false. Why?, also check $f(0)$ Feb 1 revised what can we say about $f(x)= |\cos x| + |\sin x|$ TeXing a little Dec 10 awarded Caucus Dec 10 comment Suppose $A,B,C$ are sets. Prove that $A\mathbin\triangle B\subseteq C \iff A\cup C=B\cup C$. @kuhaku I used Inkscape. I'm not sure if this apply as a rigorous proof. The one qualifying the proof should define what is rigorous enough. Nov 2 awarded Nice Answer Oct 7 awarded Yearling Oct 1 comment How to transform the following logical expression into English More like there is an engineer such as for every accountant who manages this engineer,there is a person who the accountant manages. Oct 1 revised How to transform the following logical expression into English TeXing a little Oct 1 revised Proof about a subset of a metric space TeXing a little Oct 1 revised Determine whether {¬q∧(p→q)}→¬p is tautology added 41 characters in body Oct 1 revised Find the values of $a$ and $b$ so that f will be continuous on $(-\infty, \infty)$ TeXing a little Oct 1 reviewed Approve A logic exercise (finite satisfiability) Sep 30 revised Decimal expansion of a Cauchy sequence minor corrections. Sep 30 comment Decimal expansion of a Cauchy sequence @ChristianBueno The second $b_n$ sequence is pretty close to the decimal expansion of $a$, although in some cases the $n$th digit might be off by 1. Sep 30 awarded Explainer Sep 16 revised Recursive definition of multiplication TeXing a little Apr 22 awarded Enlightened