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Mathematical logic, need d and e 2.21 Produce counterexamples to show that the following wfs are not logic- ally valid (that is, in each case,

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Mathematical logic, need d and e

2.21 Produce counterexamples to show that the following wfs are not logic- ally valid (that is, in each case, find an interpretation for which the wf is not true). (3x)(Vy)-Af(x, y) (c) (3x)(3x)A?(x,y) (3y)A?(y,y) (d) Er)A(x)(x)Ax)(x)(Al(x)Al(x))

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