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Mirrors > Home > MPE Home > Th. List > Mathboxes > resum2sqorgt0 | Structured version Visualization version GIF version |
Description: The sum of the square of two real numbers is greater than zero if at least one of the real numbers is nonzero. (Contributed by AV, 26-Feb-2023.) |
Ref | Expression |
---|---|
resum2sqcl.q | ⊢ 𝑄 = ((𝐴↑2) + (𝐵↑2)) |
Ref | Expression |
---|---|
resum2sqorgt0 | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐴 ≠ 0 ∨ 𝐵 ≠ 0)) → 0 < 𝑄) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | resum2sqcl.q | . . . . . . 7 ⊢ 𝑄 = ((𝐴↑2) + (𝐵↑2)) | |
2 | 1 | resum2sqgt0 44743 | . . . . . 6 ⊢ (((𝐴 ∈ ℝ ∧ 𝐴 ≠ 0) ∧ 𝐵 ∈ ℝ) → 0 < 𝑄) |
3 | 2 | ex 415 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 ≠ 0) → (𝐵 ∈ ℝ → 0 < 𝑄)) |
4 | 3 | expcom 416 | . . . 4 ⊢ (𝐴 ≠ 0 → (𝐴 ∈ ℝ → (𝐵 ∈ ℝ → 0 < 𝑄))) |
5 | 4 | com23 86 | . . 3 ⊢ (𝐴 ≠ 0 → (𝐵 ∈ ℝ → (𝐴 ∈ ℝ → 0 < 𝑄))) |
6 | eqid 2821 | . . . . . . 7 ⊢ ((𝐵↑2) + (𝐴↑2)) = ((𝐵↑2) + (𝐴↑2)) | |
7 | 6 | resum2sqgt0 44743 | . . . . . 6 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → 0 < ((𝐵↑2) + (𝐴↑2))) |
8 | 1 | breq2i 5074 | . . . . . . 7 ⊢ (0 < 𝑄 ↔ 0 < ((𝐴↑2) + (𝐵↑2))) |
9 | resqcl 13491 | . . . . . . . . . . 11 ⊢ (𝐴 ∈ ℝ → (𝐴↑2) ∈ ℝ) | |
10 | 9 | adantl 484 | . . . . . . . . . 10 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → (𝐴↑2) ∈ ℝ) |
11 | 10 | recnd 10669 | . . . . . . . . 9 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → (𝐴↑2) ∈ ℂ) |
12 | resqcl 13491 | . . . . . . . . . . 11 ⊢ (𝐵 ∈ ℝ → (𝐵↑2) ∈ ℝ) | |
13 | 12 | ad2antrr 724 | . . . . . . . . . 10 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → (𝐵↑2) ∈ ℝ) |
14 | 13 | recnd 10669 | . . . . . . . . 9 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → (𝐵↑2) ∈ ℂ) |
15 | 11, 14 | addcomd 10842 | . . . . . . . 8 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → ((𝐴↑2) + (𝐵↑2)) = ((𝐵↑2) + (𝐴↑2))) |
16 | 15 | breq2d 5078 | . . . . . . 7 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → (0 < ((𝐴↑2) + (𝐵↑2)) ↔ 0 < ((𝐵↑2) + (𝐴↑2)))) |
17 | 8, 16 | syl5bb 285 | . . . . . 6 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → (0 < 𝑄 ↔ 0 < ((𝐵↑2) + (𝐴↑2)))) |
18 | 7, 17 | mpbird 259 | . . . . 5 ⊢ (((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) ∧ 𝐴 ∈ ℝ) → 0 < 𝑄) |
19 | 18 | ex 415 | . . . 4 ⊢ ((𝐵 ∈ ℝ ∧ 𝐵 ≠ 0) → (𝐴 ∈ ℝ → 0 < 𝑄)) |
20 | 19 | expcom 416 | . . 3 ⊢ (𝐵 ≠ 0 → (𝐵 ∈ ℝ → (𝐴 ∈ ℝ → 0 < 𝑄))) |
21 | 5, 20 | jaoi 853 | . 2 ⊢ ((𝐴 ≠ 0 ∨ 𝐵 ≠ 0) → (𝐵 ∈ ℝ → (𝐴 ∈ ℝ → 0 < 𝑄))) |
22 | 21 | 3imp31 1108 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ (𝐴 ≠ 0 ∨ 𝐵 ≠ 0)) → 0 < 𝑄) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 ∨ wo 843 ∧ w3a 1083 = wceq 1537 ∈ wcel 2114 ≠ wne 3016 class class class wbr 5066 (class class class)co 7156 ℝcr 10536 0cc0 10537 + caddc 10540 < clt 10675 2c2 11693 ↑cexp 13430 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-2nd 7690 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-nn 11639 df-2 11701 df-n0 11899 df-z 11983 df-uz 12245 df-seq 13371 df-exp 13431 |
This theorem is referenced by: itsclc0xyqsolr 44805 itsclinecirc0in 44811 inlinecirc02plem 44822 |
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