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 Mar 11 comment Is there a word similar to “iff” meaning “one and only one”? @SteveJessop No, it is not equally sensiitive. It's much easier to overlook a typo in a word than in a number. Mar 11 comment Prove that the complex expression is real @CiaPan "You don't need an induction in this case" sounds to me like "the story is not complete". I don't buy this. Mar 10 revised Keep factoring and concatenating to get a prime? added 45 characters in body Mar 10 answered Keep factoring and concatenating to get a prime? Mar 9 comment Induction - Examples where the induction step is correct but the base case is always wrong This is soooooo good! Thanks for it! It'll go in my Discrete Mathematics problem sessions! :) Mar 7 comment Would you ever stop rolling the die? @luegofuego However, as I show, this is not the case, since the series behaves like $~n^2 (1-p)^n$, which is convergent. Mar 7 revised Would you ever stop rolling the die? edited body Mar 7 answered Would you ever stop rolling the die? Mar 2 comment Proving that $\{u_k\}_{k=1}^\infty$, $u_k=\left\{1,\frac{1}{2},\frac{1}{3},\dots,\frac{1}{k},0,0,\dots\right\}$, does not converge in a metric space @Scientifica The ping from there has reached me! :) Mar 2 revised Proving that $\{u_k\}_{k=1}^\infty$, $u_k=\left\{1,\frac{1}{2},\frac{1}{3},\dots,\frac{1}{k},0,0,\dots\right\}$, does not converge in a metric space added 28 characters in body Mar 2 comment Proving that $\{u_k\}_{k=1}^\infty$, $u_k=\left\{1,\frac{1}{2},\frac{1}{3},\dots,\frac{1}{k},0,0,\dots\right\}$, does not converge in a metric space @mercio That seems to be what I'm saying, and it seems to be some bullsh** at the same time. Sorry for that, I'll correct the answer. Mar 2 revised Notation for difference of two dates You can see the code for placing the thingy below. If you like it, you can use it in the other occurences. Mar 2 suggested approved edit on Notation for difference of two dates Mar 2 comment Proving that $\{u_k\}_{k=1}^\infty$, $u_k=\left\{1,\frac{1}{2},\frac{1}{3},\dots,\frac{1}{k},0,0,\dots\right\}$, does not converge in a metric space @Reveillark That's really a nit-picking. There's the metric $d$ which extends to $\ell^*$ and defines the topology. I really don't like this type of proofs. Yes, you can prove that the sequence doesn't converge "by hand". But it's much more natural to thing in general terms; find a natural way that would work for all similar sequences. Mar 2 answered Proving that $\{u_k\}_{k=1}^\infty$, $u_k=\left\{1,\frac{1}{2},\frac{1}{3},\dots,\frac{1}{k},0,0,\dots\right\}$, does not converge in a metric space Jan 28 comment Is there a notation for being “a finite subset of”? @Lehs Even though, if the fact that $A\subset B$ was particularly important and crucial for something, and not obvious at the moment in the current context, I would not hesitate much to say: "... because, from (3.14) we see that $A$ is a finite subset of $B$", or something in that manner. You are right that everything can be expressed in symbols, and it should be used as a good tool! Use symbol when appropriate, and accompany them with words when appropriate. Jan 28 awarded Nice Answer Jan 28 comment Is there a notation for being “a finite subset of”? @Lehs No notation is able to explain an important fact. Only words can. Jan 27 revised Is there a notation for being “a finite subset of”? added mathcal to P Jan 27 revised Is there a notation for being “a finite subset of”? added 28 characters in body