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3Â¥: Originally posted by ycqdomain at 2014-02-14 11:41:56
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P.A.M.Dirac

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\[
|\langle f|H_1+H_2|i\rangle|^2=\langle f|H_1+H_2|i\rangle\langle i|H_1+H_2|f\rangle\\
=\langle f|H_1|i\rangle\langle i|H_1|f\rangle+\langle f|H_2|i\rangle\langle i|H_2|f\rangle
+\langle f|H_1|i\rangle\langle i|H_2|f\rangle+\langle f|H_2|i\rangle\langle i|H_1|f\rangle\\
=|\langle f|H_1|i\rangle|^2+|\langle f|H_2|i\rangle|^2
+\langle f|H_1|i\rangle\langle i|H_2|f\rangle+\langle f|H_2|i\rangle\langle i|H_1|f\rangle\\
\]

http://multiverse.lamost.org/testbed/matheditor/maditor.html
2Â¥2014-02-13 11:56:48
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3Â¥2014-02-14 11:41:56
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ÒýÓûØÌû:
2Â¥: Originally posted by P.A.M.Dirac at 2014-02-13 11:56:48
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