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 Apr 28 revised Prove that the product of two invertible matrices also invertible added latex Apr 28 revised The area of trapezium is given by $A=(a^2-x^2)(x+a)$. Find x for the area to be a maximum and find A max. fixed latex, also this is not abstract algebra. Apr 28 revised Dimension of Algebraic Variety added latex. Apr 28 revised Proving a pseudo prime fixed latex. Apr 22 revised f(x) is a function such that $\lim_{x\to0} f(x)/x=1$ Improved latex. Apr 11 revised How to prove $|x-y|\le \delta\lor |x^2-y^2|\gt \epsilon$ with the following condition? Uses more standard epsilon and delta as opposed to e and d. Apr 10 revised Solve the PDE $\frac{\partial u}{\partial t}+\frac{\partial u}{\partial x}=x$ using Laplace transform in $t$ added latex. Mar 22 revised Finding the value of a trigonometric function given the value of $\tan(\alpha)\tan(\beta)$ Converted stuff to latex. Jan 13 revised integral problem - what is the quickest solution? Placed equation in center of the page. Sep 24 revised Dot product of two vectors with respect to their sum and difference. edited title Sep 11 revised When to use which derivative expanded function? Fixed formulas. Aug 21 revised Area of $A'B'C'$ is to area of $ABC$ is $\frac{(m-n)^2}{m^2+mn+n^2}$ Fixed title latex. Jun 2 revised Polynomial in several variables over $GF(2)$ Improved legibility. Jun 2 revised If I invert the argument, should I invert the constants in the equation? Made it easier to read. May 8 revised Help show the following isomorphism cannot exist. edited body May 8 revised Help show the following isomorphism cannot exist. added 4 characters in body Feb 18 revised Where does the function $f(x) =\Big[\frac{1}{2}*x\Big]$ contain discontinuities, left or right continuous? deleted 98 characters in body Feb 18 revised Does my proof about convergent sequences look ok? Added latex. Feb 17 revised How do I put this differential equation into mathcad 11 Added equation. Feb 11 revised Integration of a differential that is a function of itself. added latex for ease of reading.