- #1
penguin007
- 77
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Hi all,
I'm studying my mathematics lesson, and there is an example I can't understand:
Consider the matrix
A=(0 In)
(-In 0)
with In the identity nxn
We want to compute detA :
We introduce the permutation
p=(1 2 ... n n+1 ... 2n)
(n n+1 ... 2n 1 ... n )
s.t if we apply p to the columns of A, then we get
B=(In 0)
(0 -In)
(so far so good)
then we say: detB=(-1)^n (ok)
the sign of p is (-1)^n (all right)
then detA=(-1)^n*(-1)^n=1...(why?)
Thanks in advance
I'm studying my mathematics lesson, and there is an example I can't understand:
Consider the matrix
A=(0 In)
(-In 0)
with In the identity nxn
We want to compute detA :
We introduce the permutation
p=(1 2 ... n n+1 ... 2n)
(n n+1 ... 2n 1 ... n )
s.t if we apply p to the columns of A, then we get
B=(In 0)
(0 -In)
(so far so good)
then we say: detB=(-1)^n (ok)
the sign of p is (-1)^n (all right)
then detA=(-1)^n*(-1)^n=1...(why?)
Thanks in advance
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