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Jun
20
answered Proofs utilizing the Well-Ordering Property
Jun
20
comment Best way to show $\cfrac{1}{1+x^2}$ is a contraction?
The title of your question is really weird. How $\cfrac{1}{1+x^2}$ could be a contradiction?
Jun
20
accepted Confusion in the proof of the derivative of $u(x)/v(x)?$
Jun
19
accepted Why the distance from the point to the line is $\frac{|(P-Q)\cdot N|}{\|N\|}$?
Jun
19
comment Why the distance from the point to the line is $\frac{|(P-Q)\cdot N|}{\|N\|}$?
Não, o a fórmula da projeção eu entendo. Só não tava sabendo de onde estavam vindo as coisas no livro do Apostol. Agora ficou claro.
Jun
19
comment Why the distance from the point to the line is $\frac{|(P-Q)\cdot N|}{\|N\|}$?
Ah, sim. Eu sei fazer de um outro jeito só que fica absurdamente mais complicado. O outro jeito faz sentido na minha cabeça, no caso desse, eu preciso justificar direitinho na mente ainda.
Jun
19
asked Why the distance from the point to the line is $\frac{|(P-Q)\cdot N|}{\|N\|}$?
Jun
15
awarded  Socratic
Jun
14
comment Can you find a plain aneloid?
@A.P. See here.
Jun
14
comment Confusion in the proof of the derivative of $u(x)/v(x)?$
@ThomasAndrews I put something more meaningful now. Your answer already answers my question, but I want to practice on making a nicer title.
Jun
14
revised Confusion in the proof of the derivative of $u(x)/v(x)?$
deleted 2 characters in body; edited title
Jun
14
revised Can you find a plain aneloid?
deleted 4 characters in body
Jun
14
comment Confusion in the proof of the derivative of $u(x)/v(x)?$
@ThomasAndrews I usually prefer to show that I tried to do something. But sometimes, this alters the question (just as in this case) to something meaningless/wrong.
Jun
14
comment Confusion in the proof of the derivative of $u(x)/v(x)?$
@ThomasAndrews Yes. I was aware of the hazard these assumptions could cause, but it was the only too I had.
Jun
14
comment Confusion in the proof of the derivative of $u(x)/v(x)?$
@ThomasAndrews I meant to say that I know that $B=C$, but I don't know if $A=B$ (which would also imply that A=C).
Jun
14
comment Confusion in the proof of the derivative of $u(x)/v(x)?$
@ThomasAndrews Yes. I fixed the title (is it better?). Sometimes I forget that the context I have in mind isn't shared by others, sorry for that.
Jun
14
revised Confusion in the proof of the derivative of $u(x)/v(x)?$
added 4 characters in body; edited title
Jun
14
asked Confusion in the proof of the derivative of $u(x)/v(x)?$
Jun
14
answered What are some good reasonably rigorous texts on the mathematics of infinity?
Jun
14
revised How does one explain addition?
added 32 characters in body