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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 12428 | . . . 4 ⊢ 0 ∈ ℕ0 | |
| 2 | 1 | a1i 11 | . . 3 ⊢ (𝜑 → 0 ∈ ℕ0) |
| 3 | 2 | nn0constr 33938 | . 2 ⊢ (𝜑 → 0 ∈ Constr) |
| 4 | constrnegcl.1 | . 2 ⊢ (𝜑 → 𝑋 ∈ Constr) | |
| 5 | 1red 11145 | . . 3 ⊢ (𝜑 → 1 ∈ ℝ) | |
| 6 | 5 | renegcld 11576 | . 2 ⊢ (𝜑 → -1 ∈ ℝ) |
| 7 | 4 | constrcn 33937 | . . 3 ⊢ (𝜑 → 𝑋 ∈ ℂ) |
| 8 | 7 | negcld 11491 | . 2 ⊢ (𝜑 → -𝑋 ∈ ℂ) |
| 9 | 6 | recnd 11172 | . . . . 5 ⊢ (𝜑 → -1 ∈ ℂ) |
| 10 | 7 | subid1d 11493 | . . . . . 6 ⊢ (𝜑 → (𝑋 − 0) = 𝑋) |
| 11 | 10, 7 | eqeltrd 2837 | . . . . 5 ⊢ (𝜑 → (𝑋 − 0) ∈ ℂ) |
| 12 | 9, 11 | mulcld 11164 | . . . 4 ⊢ (𝜑 → (-1 · (𝑋 − 0)) ∈ ℂ) |
| 13 | 12 | addlidd 11346 | . . 3 ⊢ (𝜑 → (0 + (-1 · (𝑋 − 0))) = (-1 · (𝑋 − 0))) |
| 14 | 11 | mulm1d 11601 | . . 3 ⊢ (𝜑 → (-1 · (𝑋 − 0)) = -(𝑋 − 0)) |
| 15 | 10 | negeqd 11386 | . . 3 ⊢ (𝜑 → -(𝑋 − 0) = -𝑋) |
| 16 | 13, 14, 15 | 3eqtrrd 2777 | . 2 ⊢ (𝜑 → -𝑋 = (0 + (-1 · (𝑋 − 0)))) |
| 17 | 7 | absnegd 15387 | . . 3 ⊢ (𝜑 → (abs‘-𝑋) = (abs‘𝑋)) |
| 18 | 8 | subid1d 11493 | . . . 4 ⊢ (𝜑 → (-𝑋 − 0) = -𝑋) |
| 19 | 18 | fveq2d 6846 | . . 3 ⊢ (𝜑 → (abs‘(-𝑋 − 0)) = (abs‘-𝑋)) |
| 20 | 10 | fveq2d 6846 | . . 3 ⊢ (𝜑 → (abs‘(𝑋 − 0)) = (abs‘𝑋)) |
| 21 | 17, 19, 20 | 3eqtr4d 2782 | . 2 ⊢ (𝜑 → (abs‘(-𝑋 − 0)) = (abs‘(𝑋 − 0))) |
| 22 | 3, 4, 3, 4, 3, 6, 8, 16, 21 | constrlccl 33934 | 1 ⊢ (𝜑 → -𝑋 ∈ Constr) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∈ wcel 2114 ‘cfv 6500 (class class class)co 7368 ℂcc 11036 0cc0 11038 1c1 11039 + caddc 11041 · cmul 11043 − cmin 11376 -cneg 11377 ℕ0cn0 12413 abscabs 15169 Constrcconstr 33906 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-rep 5226 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-rmo 3352 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-2o 8408 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-div 11807 df-nn 12158 df-2 12220 df-n0 12414 df-z 12501 df-cj 15034 df-re 15035 df-im 15036 df-abs 15171 df-constr 33907 |
| This theorem is referenced by: zconstr 33941 iconstr 33943 constrremulcl 33944 constrimcl 33947 constrmulcl 33948 constrreinvcl 33949 constrsdrg 33952 constrresqrtcl 33954 constrsqrtcl 33956 cos9thpinconstrlem1 33966 |
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