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Mirrors > Home > MPE Home > Th. List > qnegcl | Structured version Visualization version GIF version |
Description: Closure law for the negative of a rational. (Contributed by NM, 2-Aug-2004.) (Revised by Mario Carneiro, 15-Sep-2014.) |
Ref | Expression |
---|---|
qnegcl | ⊢ (𝐴 ∈ ℚ → -𝐴 ∈ ℚ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elq 12935 | . 2 ⊢ (𝐴 ∈ ℚ ↔ ∃𝑥 ∈ ℤ ∃𝑦 ∈ ℕ 𝐴 = (𝑥 / 𝑦)) | |
2 | zcn 12564 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ) | |
3 | 2 | adantr 480 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → 𝑥 ∈ ℂ) |
4 | nncn 12221 | . . . . . . 7 ⊢ (𝑦 ∈ ℕ → 𝑦 ∈ ℂ) | |
5 | 4 | adantl 481 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → 𝑦 ∈ ℂ) |
6 | nnne0 12247 | . . . . . . 7 ⊢ (𝑦 ∈ ℕ → 𝑦 ≠ 0) | |
7 | 6 | adantl 481 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → 𝑦 ≠ 0) |
8 | 3, 5, 7 | divnegd 12004 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → -(𝑥 / 𝑦) = (-𝑥 / 𝑦)) |
9 | znegcl 12598 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → -𝑥 ∈ ℤ) | |
10 | znq 12937 | . . . . . 6 ⊢ ((-𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → (-𝑥 / 𝑦) ∈ ℚ) | |
11 | 9, 10 | sylan 579 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → (-𝑥 / 𝑦) ∈ ℚ) |
12 | 8, 11 | eqeltrd 2827 | . . . 4 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → -(𝑥 / 𝑦) ∈ ℚ) |
13 | negeq 11453 | . . . . 5 ⊢ (𝐴 = (𝑥 / 𝑦) → -𝐴 = -(𝑥 / 𝑦)) | |
14 | 13 | eleq1d 2812 | . . . 4 ⊢ (𝐴 = (𝑥 / 𝑦) → (-𝐴 ∈ ℚ ↔ -(𝑥 / 𝑦) ∈ ℚ)) |
15 | 12, 14 | syl5ibrcom 246 | . . 3 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → (𝐴 = (𝑥 / 𝑦) → -𝐴 ∈ ℚ)) |
16 | 15 | rexlimivv 3193 | . 2 ⊢ (∃𝑥 ∈ ℤ ∃𝑦 ∈ ℕ 𝐴 = (𝑥 / 𝑦) → -𝐴 ∈ ℚ) |
17 | 1, 16 | sylbi 216 | 1 ⊢ (𝐴 ∈ ℚ → -𝐴 ∈ ℚ) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 395 = wceq 1533 ∈ wcel 2098 ≠ wne 2934 ∃wrex 3064 (class class class)co 7404 ℂcc 11107 0cc0 11109 -cneg 11446 / cdiv 11872 ℕcn 12213 ℤcz 12559 ℚcq 12933 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7721 ax-resscn 11166 ax-1cn 11167 ax-icn 11168 ax-addcl 11169 ax-addrcl 11170 ax-mulcl 11171 ax-mulrcl 11172 ax-mulcom 11173 ax-addass 11174 ax-mulass 11175 ax-distr 11176 ax-i2m1 11177 ax-1ne0 11178 ax-1rid 11179 ax-rnegex 11180 ax-rrecex 11181 ax-cnre 11182 ax-pre-lttri 11183 ax-pre-lttrn 11184 ax-pre-ltadd 11185 ax-pre-mulgt0 11186 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rmo 3370 df-reu 3371 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-pss 3962 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-iun 4992 df-br 5142 df-opab 5204 df-mpt 5225 df-tr 5259 df-id 5567 df-eprel 5573 df-po 5581 df-so 5582 df-fr 5624 df-we 5626 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-pred 6293 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6488 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-om 7852 df-1st 7971 df-2nd 7972 df-frecs 8264 df-wrecs 8295 df-recs 8369 df-rdg 8408 df-er 8702 df-en 8939 df-dom 8940 df-sdom 8941 df-pnf 11251 df-mnf 11252 df-xr 11253 df-ltxr 11254 df-le 11255 df-sub 11447 df-neg 11448 df-div 11873 df-nn 12214 df-z 12560 df-q 12934 |
This theorem is referenced by: qsubcl 12953 pcadd2 16830 qsubdrg 21309 vitalilem1 25488 qaa 26209 numdenneg 32526 3cubes 41987 rmxyneg 42218 mpaaeu 42451 |
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