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| Mirrors > Home > MPE Home > Th. List > 2sqreulem3 | Structured version Visualization version GIF version | ||
| Description: Lemma 3 for 2sqreu 27798 etc. (Contributed by AV, 25-Jun-2023.) |
| Ref | Expression |
|---|---|
| 2sqreulem3 | ⊢ ((𝐴 ∈ ℕ0 ∧ (𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0)) → (((𝜑 ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) ∧ (𝜓 ∧ ((𝐴↑2) + (𝐶↑2)) = 𝑃)) → 𝐵 = 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqeq2 2775 | . . . . . . . . 9 ⊢ (𝑃 = ((𝐴↑2) + (𝐵↑2)) → (((𝐴↑2) + (𝐶↑2)) = 𝑃 ↔ ((𝐴↑2) + (𝐶↑2)) = ((𝐴↑2) + (𝐵↑2)))) | |
| 2 | 1 | eqcoms 2771 | . . . . . . . 8 ⊢ (((𝐴↑2) + (𝐵↑2)) = 𝑃 → (((𝐴↑2) + (𝐶↑2)) = 𝑃 ↔ ((𝐴↑2) + (𝐶↑2)) = ((𝐴↑2) + (𝐵↑2)))) |
| 3 | 2 | adantl 487 | . . . . . . 7 ⊢ (((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) → (((𝐴↑2) + (𝐶↑2)) = 𝑃 ↔ ((𝐴↑2) + (𝐶↑2)) = ((𝐴↑2) + (𝐵↑2)))) |
| 4 | eqcom 2770 | . . . . . . . . 9 ⊢ (((𝐴↑2) + (𝐶↑2)) = ((𝐴↑2) + (𝐵↑2)) ↔ ((𝐴↑2) + (𝐵↑2)) = ((𝐴↑2) + (𝐶↑2))) | |
| 5 | 2sqreulem2 27794 | . . . . . . . . 9 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) → (((𝐴↑2) + (𝐵↑2)) = ((𝐴↑2) + (𝐶↑2)) → 𝐵 = 𝐶)) | |
| 6 | 4, 5 | biimtrid 245 | . . . . . . . 8 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) → (((𝐴↑2) + (𝐶↑2)) = ((𝐴↑2) + (𝐵↑2)) → 𝐵 = 𝐶)) |
| 7 | 6 | adantr 486 | . . . . . . 7 ⊢ (((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) → (((𝐴↑2) + (𝐶↑2)) = ((𝐴↑2) + (𝐵↑2)) → 𝐵 = 𝐶)) |
| 8 | 3, 7 | sylbid 243 | . . . . . 6 ⊢ (((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) → (((𝐴↑2) + (𝐶↑2)) = 𝑃 → 𝐵 = 𝐶)) |
| 9 | 8 | adantld 496 | . . . . 5 ⊢ (((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) → ((𝜓 ∧ ((𝐴↑2) + (𝐶↑2)) = 𝑃) → 𝐵 = 𝐶)) |
| 10 | 9 | ex 418 | . . . 4 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) → (((𝐴↑2) + (𝐵↑2)) = 𝑃 → ((𝜓 ∧ ((𝐴↑2) + (𝐶↑2)) = 𝑃) → 𝐵 = 𝐶))) |
| 11 | 10 | adantld 496 | . . 3 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) → ((𝜑 ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) → ((𝜓 ∧ ((𝐴↑2) + (𝐶↑2)) = 𝑃) → 𝐵 = 𝐶))) |
| 12 | 11 | impd 416 | . 2 ⊢ ((𝐴 ∈ ℕ0 ∧ 𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0) → (((𝜑 ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) ∧ (𝜓 ∧ ((𝐴↑2) + (𝐶↑2)) = 𝑃)) → 𝐵 = 𝐶)) |
| 13 | 12 | 3expb 1138 | 1 ⊢ ((𝐴 ∈ ℕ0 ∧ (𝐵 ∈ ℕ0 ∧ 𝐶 ∈ ℕ0)) → (((𝜑 ∧ ((𝐴↑2) + (𝐵↑2)) = 𝑃) ∧ (𝜓 ∧ ((𝐴↑2) + (𝐶↑2)) = 𝑃)) → 𝐵 = 𝐶)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∧ w3a 1103 = wceq 1569 ∈ wcel 2146 (class class class)co 7430 + caddc 11216 2c2 12410 ℕ0cn0 12619 ↑cexp 14217 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7761 ax-cnex 11269 ax-resscn 11270 ax-1cn 11271 ax-icn 11272 ax-addcl 11273 ax-addrcl 11274 ax-mulcl 11275 ax-mulrcl 11276 ax-mulcom 11277 ax-addass 11278 ax-mulass 11279 ax-distr 11280 ax-i2m1 11281 ax-1ne0 11282 ax-1rid 11283 ax-rnegex 11284 ax-rrecex 11285 ax-cnre 11286 ax-pre-lttri 11287 ax-pre-lttrn 11288 ax-pre-ltadd 11289 ax-pre-mulgt0 11290 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-nel 3066 df-ral 3081 df-rex 3091 df-reu 3370 df-rab 3417 df-v 3456 df-sbc 3743 df-csb 3852 df-ss 3901 df-pss 4017 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-iun 4956 df-br 5107 df-opab 5171 df-mpt 5190 df-tr 5216 df-id 5550 df-eprel 5555 df-po 5563 df-so 5564 df-fr 5608 df-we 5610 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-pred 6311 df-ord 6372 df-on 6373 df-lim 6374 df-suc 6375 df-iota 6501 df-fun 6549 df-fn 6550 df-f 6551 df-f1 6552 df-fo 6553 df-f1o 6554 df-fv 6555 df-riota 7387 df-ov 7433 df-oprab 7434 df-mpo 7435 df-om 7888 df-2nd 8012 df-frecs 8313 df-wrecs 8344 df-recs 8393 df-rdg 8432 df-er 8731 df-en 8988 df-dom 8989 df-sdom 8990 df-pnf 11358 df-mnf 11359 df-xr 11360 df-ltxr 11361 df-le 11362 df-sub 11556 df-neg 11557 df-nn 12349 df-2 12418 df-n0 12620 df-z 12707 df-uz 12979 df-seq 14158 df-exp 14218 |
| This theorem is used by: 2sqreulem4 27796 |
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