Practice 21/22, p. 47/48

Prove:

displaymath164

displaymath165

Exercise #5/11, p. 56/58

Prove that the following wff is a valid argument:

displaymath168

displaymath169

Exercise #11/17, p. 57/58

Prove:

displaymath172

displaymath173

Exercise #5/11, p. 56/58

Prove that the following wff is a valid argument:

displaymath168

displaymath177

Practice 24/25, p. 51/52

Prove:

displaymath180

displaymath181


LONG ANDREW E
Fri Sep 6 01:11:01 EDT 2002