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Mirrors > Home > MPE Home > Th. List > Mathboxes > 8even | Structured version Visualization version GIF version |
Description: 8 is an even number. (Contributed by AV, 23-Jul-2020.) |
Ref | Expression |
---|---|
8even | ⊢ 8 ∈ Even |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 8nn 11890 | . . 3 ⊢ 8 ∈ ℕ | |
2 | 1 | nnzi 12166 | . 2 ⊢ 8 ∈ ℤ |
3 | 4t2e8 11963 | . . . . . 6 ⊢ (4 · 2) = 8 | |
4 | 3 | eqcomi 2745 | . . . . 5 ⊢ 8 = (4 · 2) |
5 | 4 | oveq1i 7201 | . . . 4 ⊢ (8 / 2) = ((4 · 2) / 2) |
6 | 4cn 11880 | . . . . 5 ⊢ 4 ∈ ℂ | |
7 | 2cn 11870 | . . . . 5 ⊢ 2 ∈ ℂ | |
8 | 2ne0 11899 | . . . . 5 ⊢ 2 ≠ 0 | |
9 | 6, 7, 8 | divcan4i 11544 | . . . 4 ⊢ ((4 · 2) / 2) = 4 |
10 | 5, 9 | eqtri 2759 | . . 3 ⊢ (8 / 2) = 4 |
11 | 4z 12176 | . . 3 ⊢ 4 ∈ ℤ | |
12 | 10, 11 | eqeltri 2827 | . 2 ⊢ (8 / 2) ∈ ℤ |
13 | iseven 44696 | . 2 ⊢ (8 ∈ Even ↔ (8 ∈ ℤ ∧ (8 / 2) ∈ ℤ)) | |
14 | 2, 12, 13 | mpbir2an 711 | 1 ⊢ 8 ∈ Even |
Colors of variables: wff setvar class |
Syntax hints: ∈ wcel 2112 (class class class)co 7191 · cmul 10699 / cdiv 11454 2c2 11850 4c4 11852 8c8 11856 ℤcz 12141 Even ceven 44692 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2018 ax-8 2114 ax-9 2122 ax-10 2143 ax-11 2160 ax-12 2177 ax-ext 2708 ax-sep 5177 ax-nul 5184 ax-pow 5243 ax-pr 5307 ax-un 7501 ax-resscn 10751 ax-1cn 10752 ax-icn 10753 ax-addcl 10754 ax-addrcl 10755 ax-mulcl 10756 ax-mulrcl 10757 ax-mulcom 10758 ax-addass 10759 ax-mulass 10760 ax-distr 10761 ax-i2m1 10762 ax-1ne0 10763 ax-1rid 10764 ax-rnegex 10765 ax-rrecex 10766 ax-cnre 10767 ax-pre-lttri 10768 ax-pre-lttrn 10769 ax-pre-ltadd 10770 ax-pre-mulgt0 10771 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2073 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2728 df-clel 2809 df-nfc 2879 df-ne 2933 df-nel 3037 df-ral 3056 df-rex 3057 df-reu 3058 df-rmo 3059 df-rab 3060 df-v 3400 df-sbc 3684 df-csb 3799 df-dif 3856 df-un 3858 df-in 3860 df-ss 3870 df-pss 3872 df-nul 4224 df-if 4426 df-pw 4501 df-sn 4528 df-pr 4530 df-tp 4532 df-op 4534 df-uni 4806 df-iun 4892 df-br 5040 df-opab 5102 df-mpt 5121 df-tr 5147 df-id 5440 df-eprel 5445 df-po 5453 df-so 5454 df-fr 5494 df-we 5496 df-xp 5542 df-rel 5543 df-cnv 5544 df-co 5545 df-dm 5546 df-rn 5547 df-res 5548 df-ima 5549 df-pred 6140 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6316 df-fun 6360 df-fn 6361 df-f 6362 df-f1 6363 df-fo 6364 df-f1o 6365 df-fv 6366 df-riota 7148 df-ov 7194 df-oprab 7195 df-mpo 7196 df-om 7623 df-wrecs 8025 df-recs 8086 df-rdg 8124 df-er 8369 df-en 8605 df-dom 8606 df-sdom 8607 df-pnf 10834 df-mnf 10835 df-xr 10836 df-ltxr 10837 df-le 10838 df-sub 11029 df-neg 11030 df-div 11455 df-nn 11796 df-2 11858 df-3 11859 df-4 11860 df-5 11861 df-6 11862 df-7 11863 df-8 11864 df-z 12142 df-even 44694 |
This theorem is referenced by: 8gbe 44841 9gbo 44842 bgoldbtbndlem1 44873 |
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