Voyska
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 Apr 5 asked If $N=aP+R$ and $P=bQ+S$, show that $\cfrac{N}{ab}=aS+R$? Apr 5 answered Why $h\phi (x)$ is analog to $\frac{\partial f}{\partial x}h+ \frac{\partial f}{\partial y}k$? Apr 3 asked Why $h\phi (x)$ is analog to $\frac{\partial f}{\partial x}h+ \frac{\partial f}{\partial y}k$? Mar 19 asked Find two matrices $A,B$ such that $AB=0, BA\neq 0$. What can you say about $(BA)(BA)$? Mar 13 asked What is the meaning of “perceiving all sets”? Mar 13 asked Is it possible to prove uniqueness without using proof by contradiction? Mar 12 asked If $A,B\in M_2(\mathbb{R})$, show that $(AB-BA)(AB-BA)$ is a scalar matrix. Mar 10 asked If $A,B$ are invertible, show that $AB$ is invertible and express $(AB)^{-1}$ in terms of $A^{-1},B^{-1}$. Mar 8 asked When is an upper triangular matrix invertible? Feb 26 asked If $a>0$, then $b<0 \implies ab < 0$? Feb 13 asked How do I prove that sine is dependent only on the angle? Jan 29 asked Define the operations for quadratic forms expressed on matrices? Jan 20 asked Where is the form $f(g(x))g'(x)$? Jan 15 asked What is the cost of factoring polynomials in $\mathbb{R}[x]$? Jan 12 asked Book filled with proofs pre-Decartes and post-Decartes? Dec 6 asked Is it actually important to translate the conics? Nov 29 asked Is $-2 h \sin (\theta ) \cos (\theta )\neq -h\sin (2\theta)$? Nov 26 asked What's the importance of conics and quadrics in the context of a course of pure mathematics? Nov 22 asked How did he went from $b_{12}$ to $\tan 2\varphi=\cfrac{2a_{12}}{a_{11}-a_{22}}$? Nov 21 asked On a non-standard approach to the classification of conics?