#python #sicp
To evaluate the expression <left> and <right> :
- Evaluate the subexpression <left> .
- If the result is a false value v , then the expression evaluates to v .
- Otherwise, the expression evaluates to the value of the subexpression <right> .
To evaluate the expression <left> or <right> :
- Evaluate the subexpression <left> .
- If the result is a true value v , then the expression evaluates to v .
- Otherwise, the expression evaluates to the value of the subexpression <right> .
To evaluate the expression not <exp> :
- Evaluate <exp> ; The value is True if the result is a false value, and False otherwise.
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