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| Mirrors > Home > MPE Home > Th. List > sqrecii | Structured version Visualization version GIF version | ||
| Description: The square of a reciprocal is the reciprocal of the square. (Contributed by NM, 17-Sep-1999.) |
| Ref | Expression |
|---|---|
| sqval.1 | ⊢ 𝐴 ∈ ℂ |
| sqreci.1 | ⊢ 𝐴 ≠ 0 |
| Ref | Expression |
|---|---|
| sqrecii | ⊢ ((1 / 𝐴)↑2) = (1 / (𝐴↑2)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-1cn 11185 | . . . 4 ⊢ 1 ∈ ℂ | |
| 2 | sqval.1 | . . . 4 ⊢ 𝐴 ∈ ℂ | |
| 3 | sqreci.1 | . . . 4 ⊢ 𝐴 ≠ 0 | |
| 4 | 1, 2, 1, 2, 3, 3 | divmuldivi 12002 | . . 3 ⊢ ((1 / 𝐴) · (1 / 𝐴)) = ((1 · 1) / (𝐴 · 𝐴)) |
| 5 | 1t1e1 12429 | . . . 4 ⊢ (1 · 1) = 1 | |
| 6 | 5 | oveq1i 7424 | . . 3 ⊢ ((1 · 1) / (𝐴 · 𝐴)) = (1 / (𝐴 · 𝐴)) |
| 7 | 4, 6 | eqtri 2783 | . 2 ⊢ ((1 / 𝐴) · (1 / 𝐴)) = (1 / (𝐴 · 𝐴)) |
| 8 | 2, 3 | reccli 11972 | . . 3 ⊢ (1 / 𝐴) ∈ ℂ |
| 9 | 8 | sqvali 14247 | . 2 ⊢ ((1 / 𝐴)↑2) = ((1 / 𝐴) · (1 / 𝐴)) |
| 10 | 2 | sqvali 14247 | . . 3 ⊢ (𝐴↑2) = (𝐴 · 𝐴) |
| 11 | 10 | oveq2i 7425 | . 2 ⊢ (1 / (𝐴↑2)) = (1 / (𝐴 · 𝐴)) |
| 12 | 7, 9, 11 | 3eqtr4i 2793 | 1 ⊢ ((1 / 𝐴)↑2) = (1 / (𝐴↑2)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: = wceq 1570 ∈ wcel 2145 ≠ wne 2955 (class class class)co 7414 ℂcc 11125 0cc0 11127 1c1 11128 · cmul 11132 / cdiv 11898 2c2 12322 ↑cexp 14128 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5251 ax-nul 5263 ax-pow 5330 ax-pr 5398 ax-un 7737 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 ax-pre-mulgt0 11204 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rmo 3365 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3740 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-pss 3919 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-iun 4953 df-br 5104 df-opab 5168 df-mpt 5187 df-tr 5213 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 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7864 df-2nd 7988 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-div 11899 df-nn 12261 df-2 12330 df-n0 12532 df-z 12619 df-uz 12891 df-seq 14069 df-exp 14129 |
| This theorem is used by: sincos6thpi 26756 cos9thpiminplylem5 34299 |
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