Enter your operators:2
Input | corresponding expression | comment |
A1*VN*T2 |
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a simple example |
A1*(FN+VN)*(I+T1+T2) |
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CI type singles projection |
exp(-(T1+T2))*(FN+VN)*exp(T1+T2) |
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linked CCSD energy projection |
A2*exp(-(T1+T2))*(FN+VN)*exp(T1+T2) |
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linked CCSD doubles projection |
A2*(FN+VN)*exp(T1+T2) |
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unlinked CCSD doubles projection |
A4*exp(-(T1+T2+T3+T4)) *(FN+VN)*exp(T1+T2+T3+T4) |
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linked CCSDTQ quadruples projection |
A1* FN+A4* VN*T2 |
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this is also valid |
T1 = ![]() |
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T2 = ![]() |
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FN = ![]() |
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HN = ![]() |
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A1 = ![]() |
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A2 = ![]() |
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input: expr ';' ; expr: sq | expr '*' expr | expr '+' expr | expr '-' expr | '-' expr %prec NEG | '(' expr ')' | exp_Token '(' expr ')' ; sq: one | a | t | fn | vn | error; a: A_Token NUM ; t: T_Token NUM ; fn: FN_Token ; vn: VN_Token ;