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Mirrors > Home > ILE Home > Th. List > 4dvdseven | GIF version |
Description: An integer which is divisible by 4 is an even integer. (Contributed by AV, 4-Jul-2021.) |
Ref | Expression |
---|---|
4dvdseven | ⊢ (4 ∥ 𝑁 → 2 ∥ 𝑁) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 2z 9089 | . . . 4 ⊢ 2 ∈ ℤ | |
2 | 1 | a1i 9 | . . 3 ⊢ (4 ∥ 𝑁 → 2 ∈ ℤ) |
3 | 4z 9091 | . . . 4 ⊢ 4 ∈ ℤ | |
4 | 3 | a1i 9 | . . 3 ⊢ (4 ∥ 𝑁 → 4 ∈ ℤ) |
5 | dvdszrcl 11505 | . . . 4 ⊢ (4 ∥ 𝑁 → (4 ∈ ℤ ∧ 𝑁 ∈ ℤ)) | |
6 | 5 | simprd 113 | . . 3 ⊢ (4 ∥ 𝑁 → 𝑁 ∈ ℤ) |
7 | 2, 4, 6 | 3jca 1161 | . 2 ⊢ (4 ∥ 𝑁 → (2 ∈ ℤ ∧ 4 ∈ ℤ ∧ 𝑁 ∈ ℤ)) |
8 | z4even 11620 | . . 3 ⊢ 2 ∥ 4 | |
9 | 8 | jctl 312 | . 2 ⊢ (4 ∥ 𝑁 → (2 ∥ 4 ∧ 4 ∥ 𝑁)) |
10 | dvdstr 11537 | . 2 ⊢ ((2 ∈ ℤ ∧ 4 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ((2 ∥ 4 ∧ 4 ∥ 𝑁) → 2 ∥ 𝑁)) | |
11 | 7, 9, 10 | sylc 62 | 1 ⊢ (4 ∥ 𝑁 → 2 ∥ 𝑁) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ∧ w3a 962 ∈ wcel 1480 class class class wbr 3929 2c2 8778 4c4 8780 ℤcz 9061 ∥ cdvds 11500 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-sep 4046 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 ax-cnex 7718 ax-resscn 7719 ax-1cn 7720 ax-1re 7721 ax-icn 7722 ax-addcl 7723 ax-addrcl 7724 ax-mulcl 7725 ax-mulrcl 7726 ax-addcom 7727 ax-mulcom 7728 ax-addass 7729 ax-mulass 7730 ax-distr 7731 ax-i2m1 7732 ax-0lt1 7733 ax-1rid 7734 ax-0id 7735 ax-rnegex 7736 ax-cnre 7738 ax-pre-ltirr 7739 ax-pre-ltwlin 7740 ax-pre-lttrn 7741 ax-pre-ltadd 7743 |
This theorem depends on definitions: df-bi 116 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-nel 2404 df-ral 2421 df-rex 2422 df-reu 2423 df-rab 2425 df-v 2688 df-sbc 2910 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-int 3772 df-br 3930 df-opab 3990 df-id 4215 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-iota 5088 df-fun 5125 df-fv 5131 df-riota 5730 df-ov 5777 df-oprab 5778 df-mpo 5779 df-pnf 7809 df-mnf 7810 df-xr 7811 df-ltxr 7812 df-le 7813 df-sub 7942 df-neg 7943 df-inn 8728 df-2 8786 df-3 8787 df-4 8788 df-n0 8985 df-z 9062 df-dvds 11501 |
This theorem is referenced by: flodddiv4lt 11640 |
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