Theorem rankrelp 45411

Description: The rank function preserves ∈. (Contributed by Eric Schmidt, 11-Oct-2025.)

Assertion

Ref	Expression
rankrelp	⊢ rank RelPres E , E (∪ (𝑅1 “ On), On)

Proof of Theorem rankrelp

Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		rankf 9716	. 2 ⊢ rank:∪ (𝑅1 “ On)⟶On
2		rankelb 9746	. . . . 5 ⊢ (𝑦 ∈ ∪ (𝑅1 “ On) → (𝑥 ∈ 𝑦 → (rank‘𝑥) ∈ (rank‘𝑦)))
3		epel 5528	. . . . 5 ⊢ (𝑥 E 𝑦 ↔ 𝑥 ∈ 𝑦)
4		fvex 6847	. . . . . 6 ⊢ (rank‘𝑦) ∈ V
5	4	epeli 5527	. . . . 5 ⊢ ((rank‘𝑥) E (rank‘𝑦) ↔ (rank‘𝑥) ∈ (rank‘𝑦))
6	2, 3, 5	3imtr4g 297	. . . 4 ⊢ (𝑦 ∈ ∪ (𝑅1 “ On) → (𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦)))
7	6	rgen 3056	. . 3 ⊢ ∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))
8	7	rgenw 3058	. 2 ⊢ ∀𝑥 ∈ ∪ (𝑅1 “ On)∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))
9		df-relp 45394	. 2 ⊢ (rank RelPres E , E (∪ (𝑅1 “ On), On) ↔ (rank:∪ (𝑅1 “ On)⟶On ∧ ∀𝑥 ∈ ∪ (𝑅1 “ On)∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))))
10	1, 8, 9	mpbir2an 717	1 ⊢ rank RelPres E , E (∪ (𝑅1 “ On), On)

Syntax hints:   → wi 4   ∈ wcel 2119  ∀wral 3054  ∪ cuni 4845   class class class wbr 5079   E cep 5524   “ cima 5628  Oncon0 6317  ⟶wf 6488  ‘cfv 6492  𝑅₁cr1 9684  rankcrnk 9685   RelPres wrelp 45393

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-10 2152  ax-11 2168  ax-12 2189  ax-ext 2712  ax-sep 5225  ax-nul 5235  ax-pow 5301  ax-pr 5369  ax-un 7685

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3or 1093  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-nf 1791  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2719  df-cleq 2732  df-clel 2815  df-nfc 2889  df-ne 2936  df-ral 3055  df-rex 3065  df-reu 3346  df-rab 3393  df-v 3434  df-sbc 3731  df-csb 3839  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-pss 3910  df-nul 4269  df-if 4462  df-pw 4538  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-int 4885  df-iun 4930  df-br 5080  df-opab 5142  df-mpt 5161  df-tr 5187  df-id 5520  df-eprel 5525  df-po 5533  df-so 5534  df-fr 5578  df-we 5580  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-res 5637  df-ima 5638  df-pred 6259  df-ord 6320  df-on 6321  df-lim 6322  df-suc 6323  df-iota 6448  df-fun 6494  df-fn 6495  df-f 6496  df-f1 6497  df-fo 6498  df-f1o 6499  df-fv 6500  df-ov 7366  df-om 7814  df-2nd 7939  df-frecs 8228  df-wrecs 8259  df-recs 8308  df-rdg 8346  df-r1 9686  df-rank 9687  df-relp 45394

This theorem is referenced by:  wffr  45412