:: NAT_2 semantic presentation
theorem Th1: :: NAT_2:1
canceled;
theorem Th2: :: NAT_2:2
theorem Th3: :: NAT_2:3
canceled;
theorem Th4: :: NAT_2:4
theorem Th5: :: NAT_2:5
theorem Th6: :: NAT_2:6
theorem Th7: :: NAT_2:7
theorem Th8: :: NAT_2:8
theorem Th9: :: NAT_2:9
theorem Th10: :: NAT_2:10
theorem Th11: :: NAT_2:11
theorem Th12: :: NAT_2:12
theorem Th13: :: NAT_2:13
theorem Th14: :: NAT_2:14
theorem Th15: :: NAT_2:15
theorem Th16: :: NAT_2:16
theorem Th17: :: NAT_2:17
theorem Th18: :: NAT_2:18
theorem Th19: :: NAT_2:19
theorem Th20: :: NAT_2:20
theorem Th21: :: NAT_2:21
theorem Th22: :: NAT_2:22
theorem Th23: :: NAT_2:23
theorem Th24: :: NAT_2:24
theorem Th25: :: NAT_2:25
theorem Th26: :: NAT_2:26
theorem Th27: :: NAT_2:27
theorem Th28: :: NAT_2:28
theorem Th29: :: NAT_2:29
:: deftheorem Def1 defines trivial NAT_2:def 1 :
theorem Th30: :: NAT_2:30
theorem Th31: :: NAT_2:31