Suppose ϕ∈L(V,F)\phi \in \mathcal L(V,\mathbf{F})ϕ∈L(V,F) and ϕ≠0\phi \ne 0ϕ=0. Prove that dimV/(null ϕ)=1\dim V / (\text{null }\phi) = 1dimV/(null ϕ)=1.
TODO