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Mirrors > Home > MPE Home > Th. List > nn0n0n1ge2b | Unicode version |
Description: A nonnegative integer is neither 0 nor 1 if and only if it is greater than or equal to 2. (Contributed by Alexander van der Vekens, 17-Jan-2018.) |
Ref | Expression |
---|---|
nn0n0n1ge2b |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nn0n0n1ge2 10884 | . . 3 | |
2 | 1 | 3expib 1199 | . 2 |
3 | ianor 488 | . . . 4 | |
4 | nne 2658 | . . . . 5 | |
5 | nne 2658 | . . . . 5 | |
6 | 4, 5 | orbi12i 521 | . . . 4 |
7 | 3, 6 | bitri 249 | . . 3 |
8 | 2pos 10652 | . . . . . . . . 9 | |
9 | breq1 4455 | . . . . . . . . 9 | |
10 | 8, 9 | mpbiri 233 | . . . . . . . 8 |
11 | 10 | a1d 25 | . . . . . . 7 |
12 | 1lt2 10727 | . . . . . . . . 9 | |
13 | breq1 4455 | . . . . . . . . 9 | |
14 | 12, 13 | mpbiri 233 | . . . . . . . 8 |
15 | 14 | a1d 25 | . . . . . . 7 |
16 | 11, 15 | jaoi 379 | . . . . . 6 |
17 | 16 | impcom 430 | . . . . 5 |
18 | nn0re 10829 | . . . . . . . 8 | |
19 | 2re 10630 | . . . . . . . 8 | |
20 | 18, 19 | jctir 538 | . . . . . . 7 |
21 | 20 | adantr 465 | . . . . . 6 |
22 | ltnle 9685 | . . . . . 6 | |
23 | 21, 22 | syl 16 | . . . . 5 |
24 | 17, 23 | mpbid 210 | . . . 4 |
25 | 24 | ex 434 | . . 3 |
26 | 7, 25 | syl5bi 217 | . 2 |
27 | 2, 26 | impcon4bid 205 | 1 |
Colors of variables: wff setvar class |
Syntax hints: -. wn 3 -> wi 4
<-> wb 184 \/ wo 368 /\ wa 369
= wceq 1395 e. wcel 1818 =/= wne 2652
class class class wbr 4452 cr 9512 0 cc0 9513 1 c1 9514
clt 9649 cle 9650 2 c2 10610 cn0 10820 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1618 ax-4 1631 ax-5 1704 ax-6 1747 ax-7 1790 ax-8 1820 ax-9 1822 ax-10 1837 ax-11 1842 ax-12 1854 ax-13 1999 ax-ext 2435 ax-sep 4573 ax-nul 4581 ax-pow 4630 ax-pr 4691 ax-un 6592 ax-resscn 9570 ax-1cn 9571 ax-icn 9572 ax-addcl 9573 ax-addrcl 9574 ax-mulcl 9575 ax-mulrcl 9576 ax-mulcom 9577 ax-addass 9578 ax-mulass 9579 ax-distr 9580 ax-i2m1 9581 ax-1ne0 9582 ax-1rid 9583 ax-rnegex 9584 ax-rrecex 9585 ax-cnre 9586 ax-pre-lttri 9587 ax-pre-lttrn 9588 ax-pre-ltadd 9589 ax-pre-mulgt0 9590 |
This theorem depends on definitions: df-bi 185 df-or 370 df-an 371 df-3or 974 df-3an 975 df-tru 1398 df-ex 1613 df-nf 1617 df-sb 1740 df-eu 2286 df-mo 2287 df-clab 2443 df-cleq 2449 df-clel 2452 df-nfc 2607 df-ne 2654 df-nel 2655 df-ral 2812 df-rex 2813 df-reu 2814 df-rab 2816 df-v 3111 df-sbc 3328 df-csb 3435 df-dif 3478 df-un 3480 df-in 3482 df-ss 3489 df-pss 3491 df-nul 3785 df-if 3942 df-pw 4014 df-sn 4030 df-pr 4032 df-tp 4034 df-op 4036 df-uni 4250 df-iun 4332 df-br 4453 df-opab 4511 df-mpt 4512 df-tr 4546 df-eprel 4796 df-id 4800 df-po 4805 df-so 4806 df-fr 4843 df-we 4845 df-ord 4886 df-on 4887 df-lim 4888 df-suc 4889 df-xp 5010 df-rel 5011 df-cnv 5012 df-co 5013 df-dm 5014 df-rn 5015 df-res 5016 df-ima 5017 df-iota 5556 df-fun 5595 df-fn 5596 df-f 5597 df-f1 5598 df-fo 5599 df-f1o 5600 df-fv 5601 df-riota 6257 df-ov 6299 df-oprab 6300 df-mpt2 6301 df-om 6701 df-recs 7061 df-rdg 7095 df-er 7330 df-en 7537 df-dom 7538 df-sdom 7539 df-pnf 9651 df-mnf 9652 df-xr 9653 df-ltxr 9654 df-le 9655 df-sub 9830 df-neg 9831 df-nn 10562 df-2 10619 df-n0 10821 |
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