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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?