Stella Biderman
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 20h comment A question about the real line and the Dirichlet function. If it is, in fact a rational line that matters. But there's a big difference between what is, in fact true vs what it looks like 20h comment A question about the real line and the Dirichlet function. Yes. Any physical representation of an object is a representation of a mathematical concept, not an actual mathematical concept. 21h comment A question about the real line and the Dirichlet function. @YuxiaoXie and yes, that's how we graph the rationals. We draw a line and say it's the rationals. Our diagrams are not mathematics. Out diagrams are things that help us understand mathematics. I can draw a circle and say it's a $1000$-gon and there's no problem, no contradiction. It's just a visual aid. 21h revised A question about the real line and the Dirichlet function. edited tags 21h comment A question about the real line and the Dirichlet function. Visually can't. But I don't know why it's so important to you what you can visually tell. Visually you can't tell the difference between $9^{9^9}$ and $9^{9^{9^9}}$ but that doesn't mean they are no in fact different. 21h answered A question about the real line and the Dirichlet function. 2d comment Normal Distribution - What should I study to understand these questions Why was this out on hold? It seems like an acceptable reference request to me 2d comment Are there an infinite number of prime numbers where removing any number of digits leaves a prime? As a side note, $1$ is not prime 2d revised Show that $\frac{\alpha+y}{\alpha+n+\beta}\in (\frac{\alpha}{\alpha+\beta};\frac{y}{n})$ added 422 characters in body; added 6 characters in body; added 1 character in body 2d comment Show that $\frac{\alpha+y}{\alpha+n+\beta}\in (\frac{\alpha}{\alpha+\beta};\frac{y}{n})$ I edited it to remove the use of a period to represent multiplication. 2d revised Show that $\frac{\alpha+y}{\alpha+n+\beta}\in (\frac{\alpha}{\alpha+\beta};\frac{y}{n})$ deleted 2 characters in body; added 10 characters in body 2d answered Show that $\frac{\alpha+y}{\alpha+n+\beta}\in (\frac{\alpha}{\alpha+\beta};\frac{y}{n})$ May 1 comment Idea behind Poincaré Bendixson theorem Your theorem is difficult to read. I would recommend using full sentences May 1 comment Assuming that the sum of the angles of any triangle is 180, how can I deduce Euclid's 5th postulate? @Chad is the formulation of the fifth postulate that I added acceptable, or is there a particular formulation you're interested in May 1 comment Assuming that the sum of the angles of any triangle is 180, how can I deduce Euclid's 5th postulate? The only edit was me adding the text of the postulate May 1 revised Assuming that the sum of the angles of any triangle is 180, how can I deduce Euclid's 5th postulate? added 140 characters in body May 1 comment Assuming that the sum of the angles of any triangle is 180, how can I deduce Euclid's 5th postulate? I'm not sure how this answers the question. The OP is talking about the parallel postulate: " Apr 30 revised Show $f$ is an isometry from $s$ to $s'$ added 1 character in body Apr 30 comment How many values does the expression $1 \pm 2 \pm 3 \pm \cdots \pm n$ take? @ObinnaNwakwue it's at the top in a box Apr 29 comment $\mathbb{Z} [\sqrt{2}]$ is an integral domain I think you mean "this implies $\sqrt{2}$ is rational"