kjetil b halvorsen
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 Apr 24 reviewed Looks OK How would I calculate an derivative with two unknown variables? Apr 24 reviewed Close Solve $(x^2+y^2+1)dy+xydx=0$ Apr 24 reviewed Looks OK Prove that a symmetric matrix with a positive diagonal entry has at least one positive eigenvalue Apr 24 reviewed Close Given letters ABCDEFGH : how many strings of length 5 can be formed using the letters ABCDEFGH if repetitions are not allowed Apr 24 reviewed Leave Open Basin of attraction an open set? Apr 24 reviewed Close Conditional probability for product of two statistics Apr 18 reviewed Close Show that $e^x+e^{-x} \geq e^0+e^0$ Apr 13 reviewed Approve Is basis change ever useful in practical linear algebra? Apr 13 reviewed Approve Is the matrix diagonalizable for all values of t? Apr 13 reviewed Approve Independence of some derived random variables Apr 4 reviewed Close Generalisation of Binomial Theorem, Leibniz Formula and similar theorems Apr 4 reviewed Leave Closed Surprising Summation (2): $\frac14 \sum_{i=1}^{2n}i(2n-i+1)=\sum_{i=1}^n i^2$ Apr 3 revised Gradient descent vs ternary search spelling spellingf Apr 2 reviewed Reopen Calculus: How do you solve this double sequence as its limit approaches infinity? Mar 26 reviewed Approve Find A non- zero vector $u$ with direction $(2,1,-5)$ and terminal point $(5,9,0)$. Mar 26 reviewed Close Does the sum ${\sum_{n=1}^{\infty}} \frac{\sqrt{n}+1}{n\sqrt{n}+\sqrt{n}+1}$ converge? Mar 26 reviewed Leave Closed are there any polynomial-exponential, bell-shaped functions? Mar 26 reviewed Close Left adjoint functor to forgetful functor from C*-algebras to *-algebras category Mar 23 reviewed Leave Closed “Natural” example of cosets Mar 16 reviewed Close Cracking a combination lock