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【简答题】
判断下列公式的类型( 式,永假式,可满足式 ) (1) F(x,y)→(G(x,y)→F(x,y)). ( ) (2) " x(F(x)→F(x))→ $ y(G(y)∧¬G(y)).( ) (3) " x $ y F(x,y)→ $ x " yF(x,y). ( ) (4) $ x " y F(x,y)→ " y $ x F(x,y). ( ) (5) " x " y (F(x,y)→F(y,x)). ( ) (6)¬( " xF(x)→ $ yG(y))∧ $ yG(y). ( )
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