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Jun
7
revised Geometric view point of this question
added 154 characters in body; added 1 character in body; added 1 character in body
Jun
6
revised $AB-BA=A$, Then A is singular?
edited title
Jun
6
revised $AB-BA=A$, Then A is singular?
deleted 18 characters in body; edited title
May
15
revised Trace of product of a hermitian matrix and a positive semidefinite matrix
added 22 characters in body
May
15
revised Trace of product of a hermitian matrix and a positive semidefinite matrix
added 15 characters in body
Apr
22
revised What is $p+4 \pmod {13}$
edited body
Apr
4
revised Find $a$ and $b$ for the function $f(x)= x^3$ if $x \leq 2$ , and $f(x)=ax^2+b$ if $x>2$
added 87 characters in body
Feb
1
revised Which of the following sets are compact?
added 187 characters in body
Jan
28
revised $T$ is bijective and homeomorphism.
added 3 characters in body
Jan
19
revised $ABCD$, $P$ is any interior point, $PA=24, PB=32, PC=28, PD=45$
added 47 characters in body
Dec
9
revised Identify quotient group
added 4 characters in body
Dec
8
revised Whether such non constant entire function exists
added 29 characters in body
Dec
3
revised Equations with variable powers
added 58 characters in body
Nov
28
revised some statements on sum of two subsets of plane. open, closed etc .
edited body
Nov
28
revised If $f: \mathbb{R} \to \mathbb{R}$ is continuous then $\{ x \in \mathbb{R} \mid f(x) > 0\}$ is an open subset of $\mathbb{R}$
added 82 characters in body
Nov
20
revised Finding class of analytic function which are constant on cicrcles
deleted 39 characters in body
Nov
20
revised Finding class of analytic function which are constant on cicrcles
added 48 characters in body
Oct
13
revised $\|a\|\le 1\Leftrightarrow -I\le a\le I$, where $a$ is a hermitian matrix
added 7 characters in body
Oct
13
revised $\|a\|\le 1\Leftrightarrow -I\le a\le I$, where $a$ is a hermitian matrix
added 8 characters in body
Oct
7
revised Show that $[0,1] \cap \mathbb{Q}$ is not compact in $[0,1]$
added 12 characters in body