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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 9345 | . . . 4 ⊢ 2 ∈ ℤ | |
2 | 1 | a1i 9 | . . 3 ⊢ (4 ∥ 𝑁 → 2 ∈ ℤ) |
3 | 4z 9347 | . . . 4 ⊢ 4 ∈ ℤ | |
4 | 3 | a1i 9 | . . 3 ⊢ (4 ∥ 𝑁 → 4 ∈ ℤ) |
5 | dvdszrcl 11935 | . . . 4 ⊢ (4 ∥ 𝑁 → (4 ∈ ℤ ∧ 𝑁 ∈ ℤ)) | |
6 | 5 | simprd 114 | . . 3 ⊢ (4 ∥ 𝑁 → 𝑁 ∈ ℤ) |
7 | 2, 4, 6 | 3jca 1179 | . 2 ⊢ (4 ∥ 𝑁 → (2 ∈ ℤ ∧ 4 ∈ ℤ ∧ 𝑁 ∈ ℤ)) |
8 | z4even 12057 | . . 3 ⊢ 2 ∥ 4 | |
9 | 8 | jctl 314 | . 2 ⊢ (4 ∥ 𝑁 → (2 ∥ 4 ∧ 4 ∥ 𝑁)) |
10 | dvdstr 11971 | . 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 104 ∧ w3a 980 ∈ wcel 2164 class class class wbr 4029 2c2 9033 4c4 9035 ℤcz 9317 ∥ cdvds 11930 |
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 615 ax-in2 616 ax-io 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-pow 4203 ax-pr 4238 ax-un 4464 ax-setind 4569 ax-cnex 7963 ax-resscn 7964 ax-1cn 7965 ax-1re 7966 ax-icn 7967 ax-addcl 7968 ax-addrcl 7969 ax-mulcl 7970 ax-mulrcl 7971 ax-addcom 7972 ax-mulcom 7973 ax-addass 7974 ax-mulass 7975 ax-distr 7976 ax-i2m1 7977 ax-0lt1 7978 ax-1rid 7979 ax-0id 7980 ax-rnegex 7981 ax-cnre 7983 ax-pre-ltirr 7984 ax-pre-ltwlin 7985 ax-pre-lttrn 7986 ax-pre-ltadd 7988 |
This theorem depends on definitions: df-bi 117 df-3or 981 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1472 df-sb 1774 df-eu 2045 df-mo 2046 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-ne 2365 df-nel 2460 df-ral 2477 df-rex 2478 df-reu 2479 df-rab 2481 df-v 2762 df-sbc 2986 df-dif 3155 df-un 3157 df-in 3159 df-ss 3166 df-pw 3603 df-sn 3624 df-pr 3625 df-op 3627 df-uni 3836 df-int 3871 df-br 4030 df-opab 4091 df-id 4324 df-xp 4665 df-rel 4666 df-cnv 4667 df-co 4668 df-dm 4669 df-iota 5215 df-fun 5256 df-fv 5262 df-riota 5873 df-ov 5921 df-oprab 5922 df-mpo 5923 df-pnf 8056 df-mnf 8057 df-xr 8058 df-ltxr 8059 df-le 8060 df-sub 8192 df-neg 8193 df-inn 8983 df-2 9041 df-3 9042 df-4 9043 df-n0 9241 df-z 9318 df-dvds 11931 |
This theorem is referenced by: flodddiv4lt 12077 |
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