Zol Tun Kul
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 May22 accepted Is comparing the differences between each vector in a triangle enough to determine if it is isosceles? May22 accepted Finding $\vec{DE}$ in a triangle $ABC$. May21 accepted Proving that this quadrilateral is a parallelogram. May20 accepted Why $\vec{AB} - s\vec{AB} = (1-s)\vec{AB}$? May11 accepted What to do if the righthand of a constraint is a variable when solving Linear programs? May11 accepted About canonical linear programs. May5 accepted Combinations for 15 equivalent objects among 3 places. Apr10 accepted About the particular solution given an homogeneous solution in a recurrence relation. Apr9 accepted How to calculate the determinant when the diagonal is in terms of $k$? Apr9 accepted How to determine column dependency without calculating the determinant? Apr9 accepted Going from $X^tAB - I = X^t$ to $X^t(AB-I) = I$ in matrix algebra. Apr9 accepted Calculating matrix determinants based on another's. Apr8 accepted What cases should I check when I am looking for the possible infinite solutions of a matrix? Apr7 accepted Determining the necessary values for a matrix' coefficients to achieve a certain rank. Apr7 accepted Why is a matrix $A$ that fulfils $AA^t = I$ invertible? Apr7 accepted How does Laplace expansion work? Apr7 accepted Find the values of $k$ that make this system inconsistent, with unique solution, and with infinite solutions. Apr6 accepted Calculating the determinant of $-2A^{-1}$ given the determinant of $A$. Apr6 accepted If a matrix is not invertible, is it still possible to find a left and/or right inverse? Apr6 accepted How to solve this homogeneous system, with a missing column?