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[obm-l] posto(<matriz>)



O que � "posto(A)"?
 
JF
----- Original Message -----
Sent: Thursday, March 20, 2003 2:30 PM
Subject: [obm-l] Re: [obm-l] Algebra Linear-Aplica�ao legal

 
A � mxn, B � nxm ==> A*B � mxm
 
m > n ==>
posto(A) <= n  e  posto(B) <= n ==>
posto(A*B) <= posto(A) <= n
 
Logo, A*B � uma matriz mxm cujo posto � n < m ==>
A*B � singular ==>
det(A*B) = 0.
 
Um abra�o,
Claudio.