Normalization constant

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Using Brillouin-Wigner perturbation theory we will proof that Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle Z=\langle N|N \rangle ^{-1} = \frac {\partial E_{n}}{\partial \epsilon_{n}}}

In this theory, the exact state and exact energy can be written as follows:

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle |N \rangle=|n \rangle+ \sum_{k=1}^{+\infty}\lambda ^k \left (\sum_{m_{1}}'...\sum_{m_{k}}' |m_{1} \rangle \frac {1}{E_{n}- \epsilon _{m_{1}}}\langle m_{1}|H'|m_{2} \rangle.\frac {1}{E_{n}- \epsilon _{m_{2}}}\langle m_{2}|H'|m_{3} \rangle...\frac {1}{E_{n}- \epsilon _{m_{k-1}}}\langle m_{k-1}|H'|m_{k} \rangle.\frac {1}{E_{n}- \epsilon _{m_{k}}}\langle m_{k}|H'|n \rangle \right ) \; (\bold 1)}

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle E_{n}=\epsilon _{n}+ \lambda \langle n|H'|n \rangle + }

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle + \sum_{k=1}^{+\infty}\lambda ^{k+1} \left ( \sum_{m_{1}}'...\sum_{m_{k}}' \langle n|H'|m_ {1} \rangle \frac {1}{E_{n}- \epsilon _{m_{1}}}\langle m_{1}|H'|m_{2} \rangle.\frac {1}{E_{n}- \epsilon _{m_{2}}}\langle m_{2}|H'|m_{3} \rangle...\frac {1}{E_{n}- \epsilon _{m_{k-1}}}\langle m_{k-1}|H'|m_{k} \rangle.\frac {1}{E_{n}- \epsilon _{m_{k}}}\langle m_{k}|H'|n \rangle \right ) }

Taking the derivative of Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle E_{n}} with respect Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \bold \epsilon _{n}} to, using the chain rule ,we get:

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \frac {\partial E_{n}}{\partial \epsilon _{n}}=1+0+ }

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle + \frac {\partial E_{n}}{\partial \epsilon _{n}} \sum_{k=1}^{+\infty}\lambda ^{k+1} \frac {\partial}{\partial E_{n}} \left ( \sum_{m_{1}}'...\sum_{m_{k}}' \langle n|H'|m_ {1} \rangle \frac {1}{E_{n}- \epsilon _{m_{1}}}\langle m_{1}|H'|m_{2} \rangle.\frac {1}{E_{n}- \epsilon _{m_{2}}}\langle m_{2}|H'|m_{3} \rangle...\frac {1}{E_{n}- \epsilon _{m_{k-1}}}\langle m_{k-1}|H'|m_{k} \rangle.\frac {1}{E_{n}- \epsilon _{m_{k}}}\langle m_{k}|H'|n \rangle \right ) }

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle =1-\frac {\partial E_{n}}{\partial \epsilon _{n}} \sum_{k=1}^{+\infty}\lambda ^{k+1} \sum_{m_{1}}'...\sum_{m_{k}}' \langle n|H'|m_ {1} \rangle \frac {1}{E_{n}- \epsilon _{m_{1}}}\langle m_{1}|H'|m_{2} \rangle.\frac {1}{E_{n}- \epsilon _{m_{2}}}\langle m_{2}|H'|m_{3} \rangle ...}

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle ...\frac {1}{E_{n}- \epsilon _{m_{p-1}}}\langle m_{p-1}|H'|m_{p} \rangle.\frac {1}{(E_{n}- \epsilon _{m_{p}})^2}\langle m_{p}|H'|m_{p+1} \rangle...\frac {1}{E_{n}- \epsilon _{m_{k-1}}}\langle m_{k-1}|H'|m_{k} \rangle.\frac {1}{E_{n}- \epsilon _{m_{k}}}\langle m_{k}|H'|n \rangle }

From this we can solve for Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \frac {\partial E_{n}}{\partial \epsilon _{n}}}

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle (\frac {\partial E_{n}}{\partial \epsilon _{n}})^{-1}=\sum_{k=1}^{+\infty}\lambda ^{k+1} \sum_{m_{1}}'...\sum_{m_{k}}' \langle n|H'|m_ {1} \rangle \frac {1}{E_{n}- \epsilon _{m_{1}}}\langle m_{1}|H'|m_{2} \rangle.\frac {1}{E_{n}- \epsilon _{m_{2}}}\langle m_{2}|H'|m_{3} \rangle ...}

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle ...\frac {1}{E_{n}- \epsilon _{m_{p-1}}}\langle m_{p-1}|H'|m_{p} \rangle.\frac {1}{(E_{n}- \epsilon _{m_{p}})^2}\langle m_{p}|H'|m_{p+1} \rangle...\frac {1}{E_{n}- \epsilon _{m_{k-1}}}\langle m_{k-1}|H'|m_{k} \rangle.\frac {1}{E_{n}- \epsilon _{m_{k}}}\langle m_{k}|H'|n \rangle \qquad \qquad \qquad \qquad (\bold 2)}

Now let's evaluate Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle Z=\langle N|N \rangle ^{-1}} from Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle (\bold 1)}

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle Z^{-1}=1+ \left ( \sum_{p=1}^{+\infty}\lambda ^p \sum_{m_{1}}'...\sum_{m_{p}}' \langle n|H'|m_{p} \rangle \frac {1}{E_{n}- \epsilon _{m_{p}}} \langle m_{p}|H'|m_{p-1} \rangle \frac {1}{E_{n}- \epsilon _{m_{p-1}}}...\langle m_{2}|H'|m_{1} \rangle \frac {1}{E_{n}- \epsilon _{m_{1}}}\langle m_{1}| \right ) \bold .}

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \bold . \left ( \sum_{q=1}^{+\infty}\lambda ^q \sum_{m'_{1}}'...\sum_{m'_{q}}' |m'_{1} \rangle \frac {1}{E_{n}- \epsilon _{m'_{1}}} \langle m'_{1}|H'|m'_{2} \rangle ...\frac {1}{E_{n}- \epsilon _{m'_{q-1}}} \langle m'_{q-1}|H'|m'_{q} \rangle \frac {1}{E_{n}- \epsilon _{m'_{q}}} \langle m'_{q}|H'|n \rangle \right )}

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