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| Mirrors > Home > MPE Home > Th. List > 1lt9 | Structured version Visualization version GIF version | ||
| Description: 1 is less than 9. (Contributed by NM, 19-Oct-2012.) (Revised by Mario Carneiro, 9-Mar-2015.) |
| Ref | Expression |
|---|---|
| 1lt9 | ⊢ 1 < 9 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1lt2 12428 | . 2 ⊢ 1 < 2 | |
| 2 | 2lt9 12463 | . 2 ⊢ 2 < 9 | |
| 3 | 1re 11223 | . . 3 ⊢ 1 ∈ ℝ | |
| 4 | 2re 12330 | . . 3 ⊢ 2 ∈ ℝ | |
| 5 | 9re 12355 | . . 3 ⊢ 9 ∈ ℝ | |
| 6 | 3, 4, 5 | lttri 11351 | . 2 ⊢ ((1 < 2 ∧ 2 < 9) → 1 < 9) |
| 7 | 1, 2, 6 | mp2an 705 | 1 ⊢ 1 < 9 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: class class class wbr 5111 1c1 11116 < clt 11258 2c2 12310 9c9 12317 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2737 ax-sep 5259 ax-nul 5271 ax-pow 5338 ax-pr 5406 ax-un 7742 ax-resscn 11172 ax-1cn 11173 ax-icn 11174 ax-addcl 11175 ax-addrcl 11176 ax-mulcl 11177 ax-mulrcl 11178 ax-mulcom 11179 ax-addass 11180 ax-mulass 11181 ax-distr 11182 ax-i2m1 11183 ax-1ne0 11184 ax-1rid 11185 ax-rnegex 11186 ax-rrecex 11187 ax-cnre 11188 ax-pre-lttri 11189 ax-pre-lttrn 11190 ax-pre-ltadd 11191 ax-pre-mulgt0 11192 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3067 df-ral 3082 df-rex 3092 df-reu 3372 df-rab 3419 df-v 3459 df-sbc 3747 df-csb 3855 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-op 4598 df-uni 4875 df-br 5112 df-opab 5176 df-mpt 5195 df-id 5558 df-po 5571 df-so 5572 df-xp 5669 df-rel 5670 df-cnv 5671 df-co 5672 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7376 df-ov 7422 df-oprab 7423 df-mpo 7424 df-er 8700 df-en 8950 df-dom 8951 df-sdom 8952 df-pnf 11260 df-mnf 11261 df-xr 11262 df-ltxr 11263 df-le 11264 df-sub 11458 df-neg 11459 df-2 12318 df-3 12319 df-4 12320 df-5 12321 df-6 12322 df-7 12323 df-8 12324 df-9 12325 |
| This theorem is used by: 1lt10 12872 prmlem2 17202 163prm 17207 2503lem3 17221 basendxlttsetndx 17430 otpsstr 17451 ipostr 18607 log2tlbnd 27161 hgt750lem 35103 hgt750leme 35110 aks4d1p7 42908 aks4d1p8 42912 fmtno4nprmfac193 48384 2exp340mod341 48556 8exp8mod9 48559 nfermltl8rev 48565 |
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