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Related theorems GIF version |
| Description: 0 is less than 1. Theorem I.21 of [Apostol] p. 20. |
| Ref | Expression |
|---|---|
| lt01 | ⊢ 0 < 1 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax1ne0 4075 | . . . 4 ⊢ 1 ≠ 0 | |
| 2 | df-ne 1192 | . . . 4 ⊢ (1 ≠ 0 ↔ ¬ 1 = 0) | |
| 3 | 1, 2 | mpbi 164 | . . 3 ⊢ ¬ 1 = 0 |
| 4 | ax1re 4064 | . . . 4 ⊢ 1 ∈ ℝ | |
| 5 | 4 | sqgt0 4343 | . . 3 ⊢ (¬ 1 = 0 → 0 < (1 · 1)) |
| 6 | 3, 5 | ax-mp 6 | . 2 ⊢ 0 < (1 · 1) |
| 7 | 1cn 4101 | . . 3 ⊢ 1 ∈ ℂ | |
| 8 | 7 | mulid1 4114 | . 2 ⊢ (1 · 1) = 1 |
| 9 | 6, 8 | breqtr 2080 | 1 ⊢ 0 < 1 |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 = wceq 1091 ≠ wne 1190 class class class wbr 2054 (class class class)co 3001 0cc0 4028 1c1 4029 · cmulc 4032 < clt 4033 |
| This theorem is referenced by: eqneg 4378 elimgt0 4381 ltplus1t 4383 recgt0i 4385 halfpos 4421 posex 4422 nnge1t 4439 nngt0t 4441 0nnn 4443 nnrecgt0t 4447 nnleltp1t 4448 2pos 4479 3pos 4480 4pos 4481 5pos 4482 6pos 4483 7pos 4484 8pos 4485 9pos 4486 inelr 4527 lt0nnn0 4549 elnnz1 4581 halfnz 4586 zltp1let 4597 nnesq 4720 sqrlem1 4731 sqrlem2 4732 sqrlem3 4733 sqrlem6 4736 sqrlem8 4738 sqrlem9 4739 sqrlem10 4740 sqrlem11 4741 sqrlem16 4746 sqrlem19 4749 sqrlem20 4750 sqrlem21 4751 sqrlem22 4752 sqr1 4771 nthruz 4785 normlem7t 5072 norm-ii 5086 normsub 5089 projlem2 5194 projlem6 5198 projlem28 5220 strlem1 5691 strlem3a 5693 strlem5 5696 jplem1 5701 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-un 1076 ax-pow 1077 ax-reg 1078 ax-inf 1079 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-3or 582 df-3an 583 df-ex 679 df-sb 853 df-eu 1009 df-mo 1010 df-clab 1093 df-cleq 1097 df-clel 1099 df-ne 1192 df-ral 1205 df-rex 1206 df-reu 1207 df-rab 1208 df-v 1349 df-sbc 1441 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-pss 1494 df-nul 1708 df-if 1777 df-pw 1799 df-sn 1811 df-pr 1812 df-tp 1814 df-op 1815 df-uni 1920 df-int 1966 df-iun 1996 df-tr 2042 df-br 2063 df-opab 2098 df-eprel 2122 df-id 2125 df-po 2128 df-so 2138 df-fr 2169 df-we 2186 df-ord 2202 df-on 2203 df-lim 2204 df-suc 2205 df-om 2373 df-xp 2424 df-rel 2425 df-cnv 2426 df-co 2427 df-dm 2428 df-rn 2429 df-res 2430 df-ima 2431 df-fun 2432 df-fn 2433 df-f 2434 df-f1 2435 df-fv 2438 df-rdg 2970 df-opr 3003 df-oprab 3004 df-1o 3104 df-oadd 3106 df-omul 3107 df-er 3200 df-ec 3202 df-qs 3205 df-ni 3794 df-pli 3795 df-mi 3796 df-lti 3797 df-plpq 3829 df-mpq 3830 df-enq 3831 df-nq 3832 df-plq 3833 df-mq 3834 df-rq 3835 df-ltq 3836 df-1q 3837 df-np 3880 df-1p 3881 df-plp 3882 df-mp 3883 df-ltp 3884 df-plpr 3958 df-mpr 3959 df-enr 3960 df-nr 3961 df-plr 3962 df-mr 3963 df-ltr 3964 df-0r 3965 df-1r 3966 df-m1r 3967 df-c 4034 df-0 4035 df-1 4036 df-r 4038 df-plus 4039 df-mul 4040 df-lt 4041 df-sub 4133 df-neg 4135 |