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| Mirrors > Home > ILE Home > Th. List > le9lt10 | GIF version | ||
| Description: A "decimal digit" (i.e. a nonnegative integer less than or equal to 9) is less then 10. (Contributed by AV, 8-Sep-2021.) |
| Ref | Expression |
|---|---|
| le9lt10.c | ⊢ 𝐴 ∈ ℕ0 |
| le9lt10.e | ⊢ 𝐴 ≤ 9 |
| Ref | Expression |
|---|---|
| le9lt10 | ⊢ 𝐴 < ;10 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | le9lt10.e | . . 3 ⊢ 𝐴 ≤ 9 | |
| 2 | le9lt10.c | . . . . 5 ⊢ 𝐴 ∈ ℕ0 | |
| 3 | 2 | nn0zi 9491 | . . . 4 ⊢ 𝐴 ∈ ℤ |
| 4 | 9nn0 9416 | . . . . 5 ⊢ 9 ∈ ℕ0 | |
| 5 | 4 | nn0zi 9491 | . . . 4 ⊢ 9 ∈ ℤ |
| 6 | zleltp1 9525 | . . . 4 ⊢ ((𝐴 ∈ ℤ ∧ 9 ∈ ℤ) → (𝐴 ≤ 9 ↔ 𝐴 < (9 + 1))) | |
| 7 | 3, 5, 6 | mp2an 426 | . . 3 ⊢ (𝐴 ≤ 9 ↔ 𝐴 < (9 + 1)) |
| 8 | 1, 7 | mpbi 145 | . 2 ⊢ 𝐴 < (9 + 1) |
| 9 | 9p1e10 9603 | . 2 ⊢ (9 + 1) = ;10 | |
| 10 | 8, 9 | breqtri 4111 | 1 ⊢ 𝐴 < ;10 |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 105 ∈ wcel 2200 class class class wbr 4086 (class class class)co 6013 0cc0 8022 1c1 8023 + caddc 8025 < clt 8204 ≤ cle 8205 9c9 9191 ℕ0cn0 9392 ℤcz 9469 ;cdc 9601 |
| 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 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 ax-setind 4633 ax-cnex 8113 ax-resscn 8114 ax-1cn 8115 ax-1re 8116 ax-icn 8117 ax-addcl 8118 ax-addrcl 8119 ax-mulcl 8120 ax-addcom 8122 ax-mulcom 8123 ax-addass 8124 ax-mulass 8125 ax-distr 8126 ax-i2m1 8127 ax-0lt1 8128 ax-1rid 8129 ax-0id 8130 ax-rnegex 8131 ax-cnre 8133 ax-pre-ltirr 8134 ax-pre-ltwlin 8135 ax-pre-lttrn 8136 ax-pre-ltadd 8138 |
| This theorem depends on definitions: df-bi 117 df-3or 1003 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-reu 2515 df-rab 2517 df-v 2802 df-sbc 3030 df-dif 3200 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-int 3927 df-br 4087 df-opab 4149 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-iota 5284 df-fun 5326 df-fv 5332 df-riota 5966 df-ov 6016 df-oprab 6017 df-mpo 6018 df-pnf 8206 df-mnf 8207 df-xr 8208 df-ltxr 8209 df-le 8210 df-sub 8342 df-neg 8343 df-inn 9134 df-2 9192 df-3 9193 df-4 9194 df-5 9195 df-6 9196 df-7 9197 df-8 9198 df-9 9199 df-n0 9393 df-z 9470 df-dec 9602 |
| This theorem is referenced by: declth 9630 decltdi 9639 |
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