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ysTuan
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2 votes
0 answers
295 views

prove $xy-zw$ is irreducible in $\mathbb{C}[x,y,z,w]$

1 vote
3 answers
255 views

why the restriction of a normal operator is normal? [duplicate]

3 votes
0 answers
114 views

counterexample of restricted normal operator be normal

0 votes
1 answer
65 views

a problem from Artin, need a hint [closed]

1 vote
0 answers
57 views

unique decomposition of representation

0 votes
0 answers
54 views

$SO_2\rightarrow GL_n$

1 vote
0 answers
44 views

adjoint representation of $O_2$

0 votes
1 answer
34 views

minimal number to generate an ideal