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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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Hash: b15ac23e42a84567da07d7982d9f2df9
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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