| Mathbox for Thierry Arnoux |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > constrnegcl | Structured version Visualization version GIF version | ||
| Description: Constructible numbers are closed under additive inverse. Item (2) of Theorem 7.10 of [Stewart] p. 96. (Contributed by Thierry Arnoux, 2-Nov-2025.) |
| Ref | Expression |
|---|---|
| constrnegcl.1 | ⊢ (𝜑 → 𝑋 ∈ Constr) |
| Ref | Expression |
|---|---|
| constrnegcl | ⊢ (𝜑 → -𝑋 ∈ Constr) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nn0 12624 | . . . 4 ⊢ 0 ∈ ℕ0 | |
| 2 | 1 | a1i 11 | . . 3 ⊢ (𝜑 → 0 ∈ ℕ0) |
| 3 | 2 | nn0constr 34439 | . 2 ⊢ (𝜑 → 0 ∈ Constr) |
| 4 | constrnegcl.1 | . 2 ⊢ (𝜑 → 𝑋 ∈ Constr) | |
| 5 | 1red 11312 | . . 3 ⊢ (𝜑 → 1 ∈ ℝ) | |
| 6 | 5 | renegcld 11746 | . 2 ⊢ (𝜑 → -1 ∈ ℝ) |
| 7 | 4 | constrcn 34438 | . . 3 ⊢ (𝜑 → 𝑋 ∈ ℂ) |
| 8 | 7 | negcld 11659 | . 2 ⊢ (𝜑 → -𝑋 ∈ ℂ) |
| 9 | 6 | recnd 11340 | . . . . 5 ⊢ (𝜑 → -1 ∈ ℂ) |
| 10 | 7 | subid1d 11661 | . . . . . 6 ⊢ (𝜑 → (𝑋 − 0) = 𝑋) |
| 11 | 10, 7 | eqeltrd 2860 | . . . . 5 ⊢ (𝜑 → (𝑋 − 0) ∈ ℂ) |
| 12 | 9, 11 | mulcld 11332 | . . . 4 ⊢ (𝜑 → ( -1 · (𝑋 − 0)) ∈ ℂ) |
| 13 | 12 | addlidd 11514 | . . 3 ⊢ (𝜑 → (0 + ( -1 · (𝑋 − 0))) = ( -1 · (𝑋 − 0))) |
| 14 | 11 | mulm1d 11771 | . . 3 ⊢ (𝜑 → ( -1 · (𝑋 − 0)) = -(𝑋 − 0)) |
| 15 | 10 | negeqd 11554 | . . 3 ⊢ (𝜑 → -(𝑋 − 0) = -𝑋) |
| 16 | 13, 14, 15 | 3eqtrrd 2800 | . 2 ⊢ (𝜑 → -𝑋 = (0 + ( -1 · (𝑋 − 0)))) |
| 17 | 7 | absnegd 15624 | . . 3 ⊢ (𝜑 → (abs‘ -𝑋) = (abs‘𝑋)) |
| 18 | 8 | subid1d 11661 | . . . 4 ⊢ (𝜑 → ( -𝑋 − 0) = -𝑋) |
| 19 | 18 | fveq2d 6889 | . . 3 ⊢ (𝜑 → (abs‘( -𝑋 − 0)) = (abs‘ -𝑋)) |
| 20 | 10 | fveq2d 6889 | . . 3 ⊢ (𝜑 → (abs‘(𝑋 − 0)) = (abs‘𝑋)) |
| 21 | 17, 19, 20 | 3eqtr4d 2805 | . 2 ⊢ (𝜑 → (abs‘( -𝑋 − 0)) = (abs‘(𝑋 − 0))) |
| 22 | 3, 4, 3, 4, 3, 6, 8, 16, 21 | constrlccl 34435 | 1 ⊢ (𝜑 → -𝑋 ∈ Constr) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2144 ‘cfv 6538 (class class class)co 7420 ℂcc 11201 0cc0 11203 1c1 11204 + caddc 11206 · cmul 11208 − cmin 11544 -cneg 11545 ℕ0cn0 12609 abscabs 15406 Constrcconstr 34407 |
| 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 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-rep 5231 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-cnex 11259 ax-resscn 11260 ax-1cn 11261 ax-icn 11262 ax-addcl 11263 ax-addrcl 11264 ax-mulcl 11265 ax-mulrcl 11266 ax-mulcom 11267 ax-addass 11268 ax-mulass 11269 ax-distr 11270 ax-i2m1 11271 ax-1ne0 11272 ax-1rid 11273 ax-rnegex 11274 ax-rrecex 11275 ax-cnre 11276 ax-pre-lttri 11277 ax-pre-lttrn 11278 ax-pre-ltadd 11279 ax-pre-mulgt0 11280 |
| 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 2099 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 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-tp 4589 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-frecs 8302 df-wrecs 8333 df-recs 8382 df-rdg 8421 df-1o 8479 df-2o 8480 df-er 8720 df-en 8977 df-dom 8978 df-sdom 8979 df-fin 8980 df-pnf 11348 df-mnf 11349 df-xr 11350 df-ltxr 11351 df-le 11352 df-sub 11546 df-neg 11547 df-div 11977 df-nn 12339 df-2 12408 df-n0 12610 df-z 12697 df-cj 15271 df-re 15272 df-im 15273 df-abs 15408 df-constr 34408 |
| This theorem is used by: zconstr 34442 iconstr 34444 constrremulcl 34445 constrimcl 34448 constrmulcl 34449 constrreinvcl 34450 constrsdrg 34453 constrresqrtcl 34455 constrsqrtcl 34457 cos9thpinconstrlem1 34467 |
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