nltmnf - Intuitionistic Logic Explorer

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Theorem nltmnf 9790

Description: No extended real is less than minus infinity. (Contributed by NM, 15-Oct-2005.)

**Assertion**
Ref	Expression
nltmnf

**Proof of Theorem nltmnf**
Step	Hyp	Ref	Expression
1		mnfnre 8002	. . . . . . 7
2	1	neli 2444	. . . . . 6
3	2	intnan 929	. . . . 5 $/\$
4	3	intnanr 930	. . . 4 $/\$ $/\$
5		pnfnemnf 8014	. . . . . 6
6	5	nesymi 2393	. . . . 5
7	6	intnan 929	. . . 4 $/\$
8	4, 7	pm3.2ni 813	. . 3 $/\$ $/\$ $\/$ $/\$
9	6	intnan 929	. . . 4 $/\$
10	2	intnan 929	. . . 4 $/\$
11	9, 10	pm3.2ni 813	. . 3 $/\$ $\/$ $/\$
12	8, 11	pm3.2ni 813	. 2 $/\$ $/\$ $\/$ $/\$ $\/$ $/\$ $\/$ $/\$
13		mnfxr 8016	. . 3
14		ltxr 9777	. . 3 $/\$ $/\$ $/\$ $\/$ $/\$ $\/$ $/\$ $\/$ $/\$
15	13, 14	mpan2 425	. 2 $/\$ $/\$ $\/$ $/\$ $\/$ $/\$ $\/$ $/\$
16	12, 15	mtbiri 675	1

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $/\$ wa 104

wb 105 $\/$ wo 708

wceq 1353

wcel 2148 class class class wbr 4005

cr 7812

cltrr 7817

cpnf 7991

cmnf 7992

cxr 7993

clt 7994

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-sep 4123 ax-pow 4176 ax-pr 4211 ax-un 4435 ax-setind 4538 ax-cnex 7904 ax-resscn 7905

This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-rab 2464 df-v 2741 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-pw 3579 df-sn 3600 df-pr 3601 df-op 3603 df-uni 3812 df-br 4006 df-opab 4067 df-xp 4634 df-pnf 7996 df-mnf 7997 df-xr 7998 df-ltxr 7999

This theorem is referenced by: mnfle 9794 xrltnsym 9795 xrlttr 9797 xrltso 9798 xltnegi 9837 xposdif 9884 qbtwnxr 10260 xrmaxiflemab 11257 xrmaxltsup 11268 xrbdtri 11286 blssioo 14084