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The following exercises each contains an argument; some are valid, some not. If the argument is valid, give an informal proof. If it is not

The following exercises each contains an argument; some are valid, some not. If the argument is valid, give an informal proof. If it is not valid, use Tarskis World to construct a counterexample. image text in transcribed

12.9 tx (Cube(x) Large(x)) v (Tet(x) Small(x))] V. Tet(x) BackOf(x, c)] yx Small(x) BackOf(x, c)] 12.9 tx (Cube(x) Large(x)) v (Tet(x) Small(x))] V. Tet(x) BackOf(x, c)] yx Small(x) BackOf(x, c)]

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