Theorem 1pru 7873

Description: The upper cut of the positive real number 'one'. (Contributed by Jim Kingdon, 28-Dec-2019.)

Assertion

Ref	Expression
1pru	⊢ (2nd ‘1P) = {𝑥 ∣ 1Q <Q 𝑥}

Proof of Theorem 1pru

Dummy variable 𝑦 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		df-i1p 7784	. . 3 ⊢ 1P = ⟨{𝑦 ∣ 𝑦 <Q 1Q}, {𝑥 ∣ 1Q <Q 𝑥}⟩
2	1	fveq2i 5675	. 2 ⊢ (2nd ‘1P) = (2nd ‘⟨{𝑦 ∣ 𝑦 <Q 1Q}, {𝑥 ∣ 1Q <Q 𝑥}⟩)
3		ltnqex 7866	. . 3 ⊢ {𝑦 ∣ 𝑦 <Q 1Q} ∈ V
4		gtnqex 7867	. . 3 ⊢ {𝑥 ∣ 1Q <Q 𝑥} ∈ V
5	3, 4	op2nd 6343	. 2 ⊢ (2nd ‘⟨{𝑦 ∣ 𝑦 <Q 1Q}, {𝑥 ∣ 1Q <Q 𝑥}⟩) = {𝑥 ∣ 1Q <Q 𝑥}
6	2, 5	eqtri 2255	1 ⊢ (2nd ‘1P) = {𝑥 ∣ 1Q <Q 𝑥}

Syntax hints:   = wceq 1398  {cab 2220  ⟨cop 3694   class class class wbr 4111  ‘cfv 5354  2^nd c2nd 6335  1_Qc1q 7598   <_Q cltq 7602  1_Pc1p 7609

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2207  ax-14 2208  ax-ext 2216  ax-coll 4227  ax-sep 4230  ax-pow 4289  ax-pr 4324  ax-un 4556  ax-iinf 4712

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2085  df-mo 2086  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-reu 2529  df-rab 2531  df-v 2817  df-sbc 3045  df-csb 3141  df-dif 3215  df-un 3217  df-in 3219  df-ss 3226  df-pw 3673  df-sn 3697  df-pr 3698  df-op 3700  df-uni 3917  df-int 3952  df-iun 3995  df-br 4112  df-opab 4174  df-mpt 4175  df-id 4416  df-iom 4715  df-xp 4757  df-rel 4758  df-cnv 4759  df-co 4760  df-dm 4761  df-rn 4762  df-res 4763  df-ima 4764  df-iota 5314  df-fun 5356  df-fn 5357  df-f 5358  df-f1 5359  df-fo 5360  df-f1o 5361  df-fv 5362  df-2nd 6337  df-qs 6775  df-ni 7621  df-nqqs 7665  df-ltnqqs 7670  df-i1p 7784

This theorem is referenced by:  1idpru  7908  recexprlem1ssu  7951  recexprlemss1u  7953