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 Apr24 revised Calculating $a_n$ in $\sum_{n=1}^\infty a_n \sin(\frac{n \pi}{2})=T_0$ () -> \left(\right) Apr24 suggested approved edit on Calculating $a_n$ in $\sum_{n=1}^\infty a_n \sin(\frac{n \pi}{2})=T_0$ Apr10 comment How many distinct elements are there in $C=\{zw\mid z∈A$,$w∈B\}, z^{24}=1$ and $w^{54}=1$. But this is anyway an algebra problem. Apr8 revised Why are additional constraint and penalty term equivalent in ridge regression? deleted 8 characters in body Apr7 revised Why are additional constraint and penalty term equivalent in ridge regression? added 748 characters in body Apr7 revised How to solve the least square with $L_2$ norm constraint directly? deleted 70 characters in body Apr7 revised How to solve the least square with $L_2$ norm constraint directly? added 72 characters in body Apr7 revised The positive-definite-ness of RBF kernel deleted 5 characters in body Apr7 asked How to solve the least square with $L_2$ norm constraint directly? Apr6 revised Why are additional constraint and penalty term equivalent in ridge regression? added 17 characters in body Apr6 answered Why are additional constraint and penalty term equivalent in ridge regression? Apr6 comment Why are additional constraint and penalty term equivalent in ridge regression? Can you briefly summarize the paper (since the journal version has some pages)? Apr6 comment Why are additional constraint and penalty term equivalent in ridge regression? If $\alpha=0$, does it mean the corresponding $c$ can be any non-negative number, according to the second KKT condition? Mar20 revised How to compute/ find cancellation for the second group cohomology $H^2(G,A)$? Added a missing $in the title Mar20 suggested approved edit on How to compute/ find cancellation for the second group cohomology$H^2(G,A)\$? Jan27 comment Does Euclidean division not work for general polynomials? ED implies PID. But only polynomials of one variable can form a PID. So no. Jan25 asked Equivalence of the partial least square regresssion's iterative algorithm and its optimization problem Dec9 awarded Excavator Dec9 revised Does the curvature determine the metric? log -> \log, cos -> \cos, sin -> \sin Dec9 suggested approved edit on Does the curvature determine the metric?