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 Apr 28 reviewed Approve $\sum_{k=1}^n 1/k - \log n$ Apr 20 reviewed Approve Looking for a Function With Certain Characteristics Apr 14 reviewed Approve Is $\mathrm{span}\{v_1,v_2,v_3\}=\mathrm{span}\{v_1+v_2,v_1+v_3,v_2+v_3\}$ if $v_1,v_2,v_3\in V$ a vector space over $\mathbb{Z}_2$? Apr 6 reviewed Approve solving $y=4/x+\sqrt{x+0.2−5x}$ Apr 5 reviewed Approve Calculus 1: Optimization Word Problem - Right Triangle Mar 30 reviewed Approve How do I do this one? Mar 20 reviewed Approve discriminant tag wiki excerpt Mar 20 reviewed Approve discriminant tag wiki Feb 17 reviewed Approve Cardinality of $X \cup Y$? Feb 16 reviewed Approve sum and product of roots of polynomials: finding equations for roots Jan 5 reviewed Leave Open How to differentiate both sides with an independent variable if one doesn't have a formula? Nov 12 reviewed Approve Associative Property Nov 12 reviewed Approve An algorithm for arbitrage in currency exchange Nov 6 reviewed Leave Open Does $\mathbb E(X_1)\geq\mathbb E(X_2)$ imply $\mathbb E(\textbf1_{X_1>1})\geq\mathbb E(\textbf1_{X_2>1})$ for real-valued random variables $X_1,X_2$? Nov 3 reviewed Approve Defining Equivalence Relations on a Set Nov 1 reviewed Approve How to find Choose(m, n) mod P for large m and n? Oct 27 reviewed Approve prove trig equivalence Oct 26 reviewed Approve Solving (easy) equation Oct 13 reviewed Approve Solving exponential equation in one variable. Oct 9 reviewed Approve How do I use the power rule with $4x^2 - 2$?