• Book	Linear Algebra
  Author	Gilbert Strang
  Edition

code_begins

A=matrix([[1,1+1*i],[1-1*i,2]])
a=A[0,0]
b=A[0,1]
c=A[1,1]
ac= a*c
b2= abs(b)**2
print ac
2
print b2
2
#ac=b2
#therefore A is not positive definite

code_ends

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