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Mirrors > Home > ILE Home > Th. List > sqne2sq | GIF version |
Description: The square of a natural number can never be equal to two times the square of a natural number. (Contributed by Jim Kingdon, 17-Nov-2021.) |
Ref | Expression |
---|---|
sqne2sq | ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴↑2) ≠ (2 · (𝐵↑2))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | breq2 3789 | . . . . . . 7 ⊢ (𝑐 = 𝑧 → (2 ∥ 𝑐 ↔ 2 ∥ 𝑧)) | |
2 | 1 | notbid 624 | . . . . . 6 ⊢ (𝑐 = 𝑧 → (¬ 2 ∥ 𝑐 ↔ ¬ 2 ∥ 𝑧)) |
3 | 2 | cbvrabv 2600 | . . . . 5 ⊢ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐} = {𝑧 ∈ ℕ ∣ ¬ 2 ∥ 𝑧} |
4 | oveq2 5540 | . . . . . 6 ⊢ (𝑎 = 𝑥 → ((2↑𝑏) · 𝑎) = ((2↑𝑏) · 𝑥)) | |
5 | oveq2 5540 | . . . . . . 7 ⊢ (𝑏 = 𝑦 → (2↑𝑏) = (2↑𝑦)) | |
6 | 5 | oveq1d 5547 | . . . . . 6 ⊢ (𝑏 = 𝑦 → ((2↑𝑏) · 𝑥) = ((2↑𝑦) · 𝑥)) |
7 | 4, 6 | cbvmpt2v 5604 | . . . . 5 ⊢ (𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎)) = (𝑥 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑦 ∈ ℕ0 ↦ ((2↑𝑦) · 𝑥)) |
8 | 3, 7 | 2sqpwodd 10554 | . . . 4 ⊢ (𝐵 ∈ ℕ → ¬ 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2))))) |
9 | 8 | adantl 271 | . . 3 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ¬ 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2))))) |
10 | 3, 7 | sqpweven 10553 | . . . . 5 ⊢ (𝐴 ∈ ℕ → 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(𝐴↑2)))) |
11 | 10 | ad2antrr 471 | . . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (𝐴↑2) = (2 · (𝐵↑2))) → 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(𝐴↑2)))) |
12 | fveq2 5198 | . . . . . . 7 ⊢ ((𝐴↑2) = (2 · (𝐵↑2)) → (◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(𝐴↑2)) = (◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2)))) | |
13 | 12 | fveq2d 5202 | . . . . . 6 ⊢ ((𝐴↑2) = (2 · (𝐵↑2)) → (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(𝐴↑2))) = (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2))))) |
14 | 13 | breq2d 3797 | . . . . 5 ⊢ ((𝐴↑2) = (2 · (𝐵↑2)) → (2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(𝐴↑2))) ↔ 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2)))))) |
15 | 14 | adantl 271 | . . . 4 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (𝐴↑2) = (2 · (𝐵↑2))) → (2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(𝐴↑2))) ↔ 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2)))))) |
16 | 11, 15 | mpbid 145 | . . 3 ⊢ (((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) ∧ (𝐴↑2) = (2 · (𝐵↑2))) → 2 ∥ (2nd ‘(◡(𝑎 ∈ {𝑐 ∈ ℕ ∣ ¬ 2 ∥ 𝑐}, 𝑏 ∈ ℕ0 ↦ ((2↑𝑏) · 𝑎))‘(2 · (𝐵↑2))))) |
17 | 9, 16 | mtand 623 | . 2 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → ¬ (𝐴↑2) = (2 · (𝐵↑2))) |
18 | 17 | neqned 2252 | 1 ⊢ ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴↑2) ≠ (2 · (𝐵↑2))) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 102 ↔ wb 103 = wceq 1284 ∈ wcel 1433 ≠ wne 2245 {crab 2352 class class class wbr 3785 ◡ccnv 4362 ‘cfv 4922 (class class class)co 5532 ↦ cmpt2 5534 2nd c2nd 5786 · cmul 6986 ℕcn 8039 2c2 8089 ℕ0cn0 8288 ↑cexp 9475 ∥ cdvds 10195 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-coll 3893 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-iinf 4329 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-mulrcl 7075 ax-addcom 7076 ax-mulcom 7077 ax-addass 7078 ax-mulass 7079 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 ax-1rid 7083 ax-0id 7084 ax-rnegex 7085 ax-precex 7086 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-ltwlin 7089 ax-pre-lttrn 7090 ax-pre-apti 7091 ax-pre-ltadd 7092 ax-pre-mulgt0 7093 ax-pre-mulext 7094 ax-arch 7095 ax-caucvg 7096 |
This theorem depends on definitions: df-bi 115 df-dc 776 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-xor 1307 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rmo 2356 df-rab 2357 df-v 2603 df-sbc 2816 df-csb 2909 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-if 3352 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-int 3637 df-iun 3680 df-br 3786 df-opab 3840 df-mpt 3841 df-tr 3876 df-id 4048 df-po 4051 df-iso 4052 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-iota 4887 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-1st 5787 df-2nd 5788 df-recs 5943 df-frec 6001 df-1o 6024 df-2o 6025 df-er 6129 df-en 6245 df-sup 6397 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 df-reap 7675 df-ap 7682 df-div 7761 df-inn 8040 df-2 8098 df-3 8099 df-4 8100 df-n0 8289 df-z 8352 df-uz 8620 df-q 8705 df-rp 8735 df-fz 9030 df-fzo 9153 df-fl 9274 df-mod 9325 df-iseq 9432 df-iexp 9476 df-cj 9729 df-re 9730 df-im 9731 df-rsqrt 9884 df-abs 9885 df-dvds 10196 df-gcd 10339 df-prm 10490 |
This theorem is referenced by: sqrt2irraplemnn 10557 |
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