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sav07_lecture_3_skeleton [2007/03/20 14:44] vkuncak |
sav07_lecture_3_skeleton [2007/03/20 14:48] vkuncak |
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| when c is a basic command. | when c is a basic command. | ||
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| But if a variable is equal to another, it can be substituted using the substitution rules | But if a variable is equal to another, it can be substituted using the substitution rules | ||
| - | (exists x_1. x_1 = t & F(x_1)) <-> F(t) | + | (exists x_1. x_1=t & F(x_1)) <-> F(t) |
| - | (forall x_1. x_1 = t -> F(x_1) <-> F(t) | + | (forall x_1. x_1=t -> F(x_1) <-> F(t) |
| We can apply these rules to reduce the size of formulas. | We can apply these rules to reduce the size of formulas. | ||