Squirtle
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 Apr23 comment Algebraic number theory topics for undergrads Sure.... sure. I thought that you meant you want them to include the study of elliptic curves and other deep results from algebra that only specialists know Apr23 comment Algebraic number theory topics for undergrads first undergraduate algebra course having FLT? WTF! Apr21 asked Direct sum of Abelian groups and Isomorphism Apr20 comment Probability distribution for a random walk in arbitrary dimension Is time continuous or discreet? What textbook are you using? Mathematically.... what is a lattice constant? Why should what you wrote be the appropriate distribution? What do the brackets in $\langle \delta_{R(r),r} \rangle$ mean? This is just a thought... but maybe if you think $\mathbb{R}^d$ as $\mathbb{R}\times... \times \mathbb{R}$ then you can answer your questions since apparently you have it resolved for $d=1$. In my notation above, I mean to emphasize that this walk is really a simultaneous walk of $d$ 1-dimensional walks. Apr19 awarded Yearling Apr10 asked Book recommendation for Choquet theory Apr9 revised continuity of monotone increasing function which is defined on all of R deleted 4 characters in body Apr4 comment Period of a module vs element I'm also not sure the map $m\mapsto t_im$ makes sense? I don't understand if $m$ goes to $t_i m$ then when would the case $j\neq i$ occur? I'm just lost in notation. Apr4 comment Period of a module vs element I'm a bit lost lost why coprime implies $(l_i,l_j)=D$, in fact I'm not sure I understand what $(l_i,l_j)$ means. Is this the same as $\langle l_i,l_j \rangle$? In any case, what do you mean by your notation? Apr4 comment Period of a module vs element Yes, I guess as long as that's the case that helps a little. Still not seeing the rest of the question. I'll work on it for a little and if I get something I'll post it as an answer. Apr4 comment Period of a module vs element No, lol. I'm not sure if per(M) ={d|d.x=0 for all x in M} is appropriate, because here it's a set and later in the notes (about 10 pages later) it becomes an element (I believe a rational number). In any case, I think it would help to show the "easy exercise" and the centered equation since I'm confused on the defintion; knowing the definition and seeing a clean proof where it is used will absolutely help (these are quite poorly written notes unfortunately) Apr4 revised Period of a module vs element deleted 2 characters in body Apr4 asked Period of a module vs element Apr4 reviewed Reviewed What are the distances from a line to the tangents of a circle? Apr4 reviewed Edit What is the reciprocal of $(-1/2)^k$? Apr4 revised What is the reciprocal of $(-1/2)^k$? added 2 characters in body Apr1 comment Physically impossible to find the constant To say it's "physically" impossible is nonsensical. Apr1 comment Proof that $A$ and $B$ nonempty and closed in $\Bbb C$ means that $A\cup B$ is closed in $\Bbb C$ verification I've read it. Common sense tells me that this isn't a proof because proving that the $\mathbb{C}-(A\cup B)$ is open is just as hard as proving $A\cup B$ is closed. Your proof should rely on something more fundamental, not something equivalent in difficulty and that is logically equivalent. This answer isn't something that Incurrence didn't already know. Apr1 comment Proof that $A$ and $B$ nonempty and closed in $\Bbb C$ means that $A\cup B$ is closed in $\Bbb C$ verification This isn't a proof to the question, but rather a simple corollary. Mar30 revised Let $\{p_1, . . . , p_l\}$ be points in $\mathbb{R}^n$ . Show that the set $U = \mathbb{R}^n\setminus \{p_1, p_2, . . . , p_l\}$ is open. added 205 characters in body