Q1.
(a) Let V be a vector space over a field F. Let W be a subspace of V. Prove that V/W is a vector space over F.
(b) Let T: V o W be a linear transformation. Prove that T is injective if and only if ext{ker}(T) = {0}.
(c) Let A be an n imes n matrix. Prove that A is invertible if and only if det(A) eq 0.
(d) Let V be a finite-dimensional vector space and let T: V o V be a linear operator. Prove that V = ext{Im}(T) oplus ext{ker}(T) if and only if ext{Im}(T) = ext{ker}(T).
(e) Let A be an n imes n matrix. Prove that A is diagonalizable if and only if the algebraic multiplicity of each eigenvalue equals its geometric multiplicity.