nltmnf - Intuitionistic Logic Explorer

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Theorem nltmnf 9984

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 8189	. . . . . . 7
2	1	neli 2497	. . . . . 6
3	2	intnan 934	. . . . 5 $/\$
4	3	intnanr 935	. . . 4 $/\$ $/\$
5		pnfnemnf 8201	. . . . . 6
6	5	nesymi 2446	. . . . 5
7	6	intnan 934	. . . 4 $/\$
8	4, 7	pm3.2ni 818	. . 3 $/\$ $/\$ $\/$ $/\$
9	6	intnan 934	. . . 4 $/\$
10	2	intnan 934	. . . 4 $/\$
11	9, 10	pm3.2ni 818	. . 3 $/\$ $\/$ $/\$
12	8, 11	pm3.2ni 818	. 2 $/\$ $/\$ $\/$ $/\$ $\/$ $/\$ $\/$ $/\$
13		mnfxr 8203	. . 3
14		ltxr 9971	. . 3 $/\$ $/\$ $/\$ $\/$ $/\$ $\/$ $/\$ $\/$ $/\$
15	13, 14	mpan2 425	. 2 $/\$ $/\$ $\/$ $/\$ $\/$ $/\$ $\/$ $/\$
16	12, 15	mtbiri 679	1

Colors of variables: wff set class

Syntax hints:

wn 3

wi 4 $/\$ wa 104

wb 105 $\/$ wo 713

wceq 1395

wcel 2200 class class class wbr 4083

cr 7998

cltrr 8003

cpnf 8178

cmnf 8179

cxr 8180

clt 8181

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 617 ax-in2 618 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4202 ax-pow 4258 ax-pr 4293 ax-un 4524 ax-setind 4629 ax-cnex 8090 ax-resscn 8091

This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-fal 1401 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ne 2401 df-nel 2496 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2801 df-dif 3199 df-un 3201 df-in 3203 df-ss 3210 df-pw 3651 df-sn 3672 df-pr 3673 df-op 3675 df-uni 3889 df-br 4084 df-opab 4146 df-xp 4725 df-pnf 8183 df-mnf 8184 df-xr 8185 df-ltxr 8186

This theorem is referenced by: mnfle 9988 xrltnsym 9989 xrlttr 9991 xrltso 9992 xltnegi 10031 xposdif 10078 qbtwnxr 10477 xrmaxiflemab 11758 xrmaxltsup 11769 xrbdtri 11787 blssioo 15227