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Display information for equation id:math.1764.30 on revision:1764

* Page found: Variationsverfahren (eq math.1764.30)

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TeX (original user input):

\begin{align}

& \left\langle  \Psi  \right|\hat{H}\left| \Psi  \right\rangle =\sum\limits_{n}^{{}}{{}}\left\langle  \Psi  \right|\hat{H}\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle =\sum\limits_{n=0}^{\infty }{{}}{{E}_{n}}\left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle  \\

& \left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle =0,f\ddot{u}r\quad n=0 \\

& \Rightarrow \left\langle  \Psi  \right|\hat{H}\left| \Psi  \right\rangle =\sum\limits_{n=1}^{\infty }{{}}{{E}_{n}}\left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle  \\

& \Rightarrow {{E}_{n}}\ge {{E}_{1}} \\

& \Rightarrow \sum\limits_{n=1}^{\infty }{{}}{{E}_{n}}\left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle \ge {{E}_{1}}\sum\limits_{n=1}^{\infty }{{}}\left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle  \\

& \Rightarrow \sum\limits_{n=1}^{\infty }{{}}{{E}_{n}}\left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle \ge {{E}_{1}}\left\langle  \Psi  \right|\left| \Psi  \right\rangle \Rightarrow {{E}_{1}}\le \frac{\sum\limits_{n=1}^{\infty }{{}}{{E}_{n}}\left\langle  \Psi  \right|\left| {{\Psi }_{n}} \right\rangle \left\langle  {{\Psi }_{n}} \right|\left| \Psi  \right\rangle }{\left\langle  \Psi  \right|\left| \Psi  \right\rangle } \\

& \Rightarrow {{E}_{1}}\le \frac{\left\langle  \Psi  \right|\hat{H}\left| \Psi  \right\rangle }{\left\langle  \Psi  \right|\left| \Psi  \right\rangle } \\

\end{align}

TeX (checked):

{\begin{aligned}&\left\langle \Psi \right|{\hat {H}}\left|\Psi \right\rangle =\sum \limits _{n}^{}{}\left\langle \Psi \right|{\hat {H}}\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle =\sum \limits _{n=0}^{\infty }{}{{E}_{n}}\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle \\&\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle =0,f{\ddot {u}}r\quad n=0\\&\Rightarrow \left\langle \Psi \right|{\hat {H}}\left|\Psi \right\rangle =\sum \limits _{n=1}^{\infty }{}{{E}_{n}}\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle \\&\Rightarrow {{E}_{n}}\geq {{E}_{1}}\\&\Rightarrow \sum \limits _{n=1}^{\infty }{}{{E}_{n}}\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle \geq {{E}_{1}}\sum \limits _{n=1}^{\infty }{}\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle \\&\Rightarrow \sum \limits _{n=1}^{\infty }{}{{E}_{n}}\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle \geq {{E}_{1}}\left\langle \Psi \right|\left|\Psi \right\rangle \Rightarrow {{E}_{1}}\leq {\frac {\sum \limits _{n=1}^{\infty }{}{{E}_{n}}\left\langle \Psi \right|\left|{{\Psi }_{n}}\right\rangle \left\langle {{\Psi }_{n}}\right|\left|\Psi \right\rangle }{\left\langle \Psi \right|\left|\Psi \right\rangle }}\\&\Rightarrow {{E}_{1}}\leq {\frac {\left\langle \Psi \right|{\hat {H}}\left|\Psi \right\rangle }{\left\langle \Psi \right|\left|\Psi \right\rangle }}\\\end{aligned}}

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Ψ|Ĥ|Ψ=nΨ|Ĥ|ΨnΨn||Ψ=n=0EnΨ||ΨnΨn||ΨΨ||Ψn=0,fu¨rn=0Ψ|Ĥ|Ψ=n=1EnΨ||ΨnΨn||ΨEnE1n=1EnΨ||ΨnΨn||ΨE1n=1Ψ||ΨnΨn||Ψn=1EnΨ||ΨnΨn||ΨE1Ψ||ΨE1n=1EnΨ||ΨnΨn||ΨΨ||ΨE1Ψ|Ĥ|ΨΨ||Ψ
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