If I-AB is invertible, then I-BA is invertible. Where I is the identity matrix, and A is m by n, B is n by m.
举一反三
- Let A be an m×n matrix, then ( ). A: AAT =ATA. B: if rank(A) = m, then AT A is invertible. C: if rank(A) = n, then AAT is invertible. D: if rank(A) = n, then AT A is invertible.
- Let A be a 4 by 3 matrix, and r(A)=2, and B is an invertible matrix, then r(AB)=______
- 递延期为m期,连续支付n期,每期支付A元,折现率为i的递延年金现值等于()。 A: A×(p/A,i,n)×(p/s,i,m) B: A×[(p/A,i,m +n)-(p/A,i,m)] C: A×[(p/A,i,m +n)×(p/A,i,m)] D: A×(s/A,i,n)×(p/s,i,m +n)
- 递延年金现值( ) A: A*(P/A,i,n)*(p/F,i,m) B: A*(P/F,i,n)*(p/F,i,m) C: A*(P/A,i,n)*(p/A,i,m) D: P*(P/A,i,n)*(p/F,i,m)
- 下列债券基本模型的表达式中,正确的是()。 A: PV=I×(P/A,i,n)+M×(P/F,i,n) B: PV=I×(P/F,i,n)+M×(P/F,i,n) C: PV=I×(P/A,i,n)+M×(P/A,i,n) D: PV=I×(P/F,i,n)+M×(P/A,i,n)