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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 9464 | . . . 4 ⊢ 𝐴 ∈ ℤ |
| 4 | 9nn0 9389 | . . . . 5 ⊢ 9 ∈ ℕ0 | |
| 5 | 4 | nn0zi 9464 | . . . 4 ⊢ 9 ∈ ℤ |
| 6 | zleltp1 9498 | . . . 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 9576 | . 2 ⊢ (9 + 1) = ;10 | |
| 10 | 8, 9 | breqtri 4107 | 1 ⊢ 𝐴 < ;10 |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 105 ∈ wcel 2200 class class class wbr 4082 (class class class)co 6000 0cc0 7995 1c1 7996 + caddc 7998 < clt 8177 ≤ cle 8178 9c9 9164 ℕ0cn0 9365 ℤcz 9442 ;cdc 9574 |
| 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 4201 ax-pow 4257 ax-pr 4292 ax-un 4523 ax-setind 4628 ax-cnex 8086 ax-resscn 8087 ax-1cn 8088 ax-1re 8089 ax-icn 8090 ax-addcl 8091 ax-addrcl 8092 ax-mulcl 8093 ax-addcom 8095 ax-mulcom 8096 ax-addass 8097 ax-mulass 8098 ax-distr 8099 ax-i2m1 8100 ax-0lt1 8101 ax-1rid 8102 ax-0id 8103 ax-rnegex 8104 ax-cnre 8106 ax-pre-ltirr 8107 ax-pre-ltwlin 8108 ax-pre-lttrn 8109 ax-pre-ltadd 8111 |
| 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 2801 df-sbc 3029 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 3888 df-int 3923 df-br 4083 df-opab 4145 df-id 4383 df-xp 4724 df-rel 4725 df-cnv 4726 df-co 4727 df-dm 4728 df-iota 5277 df-fun 5319 df-fv 5325 df-riota 5953 df-ov 6003 df-oprab 6004 df-mpo 6005 df-pnf 8179 df-mnf 8180 df-xr 8181 df-ltxr 8182 df-le 8183 df-sub 8315 df-neg 8316 df-inn 9107 df-2 9165 df-3 9166 df-4 9167 df-5 9168 df-6 9169 df-7 9170 df-8 9171 df-9 9172 df-n0 9366 df-z 9443 df-dec 9575 |
| This theorem is referenced by: declth 9603 decltdi 9612 |
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