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| Mirrors > Home > MPE Home > Th. List > nqerid | Structured version Visualization version GIF version | ||
| Description: Corollary of nqereu 10995: the function [Q] acts as the identity on members of Q. (Contributed by Mario Carneiro, 6-May-2013.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| nqerid | ⊢ (𝐴 ∈ Q → ([Q]‘𝐴) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nqerf 10996 | . . 3 ⊢ [Q]:(N × N)⟶Q | |
| 2 | ffun 6704 | . . 3 ⊢ ([Q]:(N × N)⟶Q → Fun [Q]) | |
| 3 | 1, 2 | ax-mp 5 | . 2 ⊢ Fun [Q] |
| 4 | elpqn 10991 | . . 3 ⊢ (𝐴 ∈ Q → 𝐴 ∈ (N × N)) | |
| 5 | id 23 | . . 3 ⊢ (𝐴 ∈ Q → 𝐴 ∈ Q) | |
| 6 | enqer 10987 | . . . . 5 ⊢ ~Q Er (N × N) | |
| 7 | 6 | a1i 11 | . . . 4 ⊢ (𝐴 ∈ Q → ~Q Er (N × N)) |
| 8 | 7, 4 | erref 8722 | . . 3 ⊢ (𝐴 ∈ Q → 𝐴 ~Q 𝐴) |
| 9 | df-erq 10979 | . . . . 5 ⊢ [Q] = ( ~Q ∩ ((N × N) × Q)) | |
| 10 | 9 | breqi 5109 | . . . 4 ⊢ (𝐴[Q]𝐴 ↔ 𝐴( ~Q ∩ ((N × N) × Q))𝐴) |
| 11 | brinxp2 5729 | . . . 4 ⊢ (𝐴( ~Q ∩ ((N × N) × Q))𝐴 ↔ ((𝐴 ∈ (N × N) ∧ 𝐴 ∈ Q) ∧ 𝐴 ~Q 𝐴)) | |
| 12 | 10, 11 | bitri 278 | . . 3 ⊢ (𝐴[Q]𝐴 ↔ ((𝐴 ∈ (N × N) ∧ 𝐴 ∈ Q) ∧ 𝐴 ~Q 𝐴)) |
| 13 | 4, 5, 8, 12 | syl21anbrc 1363 | . 2 ⊢ (𝐴 ∈ Q → 𝐴[Q]𝐴) |
| 14 | funbrfv 6925 | . 2 ⊢ (Fun [Q] → (𝐴[Q]𝐴 → ([Q]‘𝐴) = 𝐴)) | |
| 15 | 3, 13, 14 | mpsyl 69 | 1 ⊢ (𝐴 ∈ Q → ([Q]‘𝐴) = 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ∈ wcel 2145 ∩ cin 3898 class class class wbr 5103 × cxp 5649 Fun wfun 6525 ⟶wf 6527 ‘cfv 6531 Er wer 8698 Ncnpi 10910 ~Q ceq 10917 Qcnq 10918 [Q]cerq 10920 |
| 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 2733 ax-sep 5249 ax-nul 5260 ax-pr 5391 ax-un 7740 |
| 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 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3453 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 5546 df-eprel 5551 df-po 5559 df-so 5560 df-fr 5604 df-we 5606 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-pred 6297 df-ord 6358 df-on 6359 df-lim 6360 df-suc 6361 df-iota 6487 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-fv 6539 df-ov 7415 df-oprab 7416 df-mpo 7417 df-om 7867 df-1st 7990 df-2nd 7991 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-1o 8460 df-oadd 8464 df-omul 8465 df-er 8701 df-ni 10938 df-mi 10940 df-lti 10941 df-enq 10977 df-nq 10978 df-erq 10979 df-1nq 10982 |
| This theorem is used by: addassnq 11024 mulassnq 11025 distrnq 11027 mulidnq 11029 recmulnq 11030 1lt2nq 11039 ltexnq 11041 prlem934 11099 |
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