Solve for n, N, λ_1, λ_2, N_N
n=-\frac{\lambda _{1}}{N\left(\lambda _{1}-\lambda _{2}\right)}\text{, }N\neq 0\text{, }\lambda _{1}\neq \lambda _{2}\text{, }\lambda _{2}\in \mathrm{R}\text{, }N_{N}=\frac{\lambda _{1}\lambda _{2}}{\lambda _{2}-\lambda _{1}}
n\in \mathrm{R}\text{, }N=0\text{, }\lambda _{1}=0\text{, }\lambda _{2}\in \mathrm{R}\text{, }N_{N}=0
n\in \mathrm{R}\text{, }N\in \mathrm{R}\text{, }\lambda _{1}=0\text{, }\lambda _{2}=0\text{, }N_{N}=0
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