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 1d comment Homotopy fixed points of connective K-theory This is the standard definition I believe (at least it is the one Lurie uses) Nov 25 comment Complex numbers - arg If your lazy enough to put this here, you might as well just put it in WolframAlpha and not waste everyones times. Nov 23 comment In group with order of $pq$ what are the possible values for order of an element? Do you know that the order of a subgroup divides the order of the group? Nov 23 comment In group with order of $pq$ what are the possible values for order of an element? By Lagrange, it is either $1, p, q$ or $pq$, can you find an example of each? Nov 18 comment Prove a real number in $[0,1]$ has at most two decimal expansions Subtraction makes this a problem about zero. Then work in binary to make it easy Nov 18 comment Does $0\le A \le B \Rightarrow A^2 \le B^2$ hold? If $x$ takes values in $\mathbb{C}$, then what do you mean by $\ge 0$? If you restrict to reals, the question is answered by a rotation by $\pi/2$ and the identity matrix. Nov 17 answered Sum of algebraicly independent transcendentals is transcendental? Nov 17 comment Orthogonal of the orthogonal? $x\in E^{\perp \perp}$ if and only if $(x, E^{\perp})=0$, so it clearly contains $E$. Nov 17 comment Orthogonal of the orthogonal? You know that the perp of something is closed, by continuity, and you know that it contains $E$, almost trivially, so it follows by definition. Nov 16 revised Free group with relations added 698 characters in body Nov 16 answered Free group with relations Nov 16 awarded Popular Question Nov 15 comment Convert $3^n$ to some form of $2^n$ $2^n=e^{nln(2)}=e^{nln(2)/ln(3)ln(3)}=3^{nln(2)/ln(3)}$ Nov 14 answered What is the difference between Bilinear function and Bilinear form? Nov 11 asked How to solve the following system of differential equations? Nov 10 answered Is a zero-dimensional algebra over a field a finite-dimensional vector space? Nov 9 comment Let $R$ be a ring with unit $1$ and $\phi: \mathbb Z \implies D$ be defined as $\phi(n) = n1$. Show this is an homomorphism $nx=x+\dots +x$, $n$-times. Nov 6 answered Show that if $a\neq b$ then $a^3+a\neq b^3+b$ Nov 6 comment If a property in $\mathbb{N}$ is true up to $10^{47}$ are there reasons to think it is probably true in all $\mathbb{N}$? I mean the conjecture that all numbers are less than $10^{48}$ is true if you only check up to $10^{47}$! Nov 2 awarded Yearling