Theorem rankrelp 44943

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 9753	. 2 ⊢ rank:∪ (𝑅1 “ On)⟶On
2		rankelb 9783	. . . . 5 ⊢ (𝑦 ∈ ∪ (𝑅1 “ On) → (𝑥 ∈ 𝑦 → (rank‘𝑥) ∈ (rank‘𝑦)))
3		epel 5543	. . . . 5 ⊢ (𝑥 E 𝑦 ↔ 𝑥 ∈ 𝑦)
4		fvex 6873	. . . . . 6 ⊢ (rank‘𝑦) ∈ V
5	4	epeli 5542	. . . . 5 ⊢ ((rank‘𝑥) E (rank‘𝑦) ↔ (rank‘𝑥) ∈ (rank‘𝑦))
6	2, 3, 5	3imtr4g 296	. . . 4 ⊢ (𝑦 ∈ ∪ (𝑅1 “ On) → (𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦)))
7	6	rgen 3047	. . 3 ⊢ ∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))
8	7	rgenw 3049	. 2 ⊢ ∀𝑥 ∈ ∪ (𝑅1 “ On)∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))
9		df-relp 44926	. 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 711	1 ⊢ rank RelPres E , E (∪ (𝑅1 “ On), On)

Syntax hints:   → wi 4   ∈ wcel 2109  ∀wral 3045  ∪ cuni 4873   class class class wbr 5109   E cep 5539   “ cima 5643  Oncon0 6334  ⟶wf 6509  ‘cfv 6513  𝑅₁cr1 9721  rankcrnk 9722   RelPres wrelp 44925

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2702  ax-sep 5253  ax-nul 5263  ax-pow 5322  ax-pr 5389  ax-un 7713

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2534  df-eu 2563  df-clab 2709  df-cleq 2722  df-clel 2804  df-nfc 2879  df-ne 2927  df-ral 3046  df-rex 3055  df-reu 3357  df-rab 3409  df-v 3452  df-sbc 3756  df-csb 3865  df-dif 3919  df-un 3921  df-in 3923  df-ss 3933  df-pss 3936  df-nul 4299  df-if 4491  df-pw 4567  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4874  df-int 4913  df-iun 4959  df-br 5110  df-opab 5172  df-mpt 5191  df-tr 5217  df-id 5535  df-eprel 5540  df-po 5548  df-so 5549  df-fr 5593  df-we 5595  df-xp 5646  df-rel 5647  df-cnv 5648  df-co 5649  df-dm 5650  df-rn 5651  df-res 5652  df-ima 5653  df-pred 6276  df-ord 6337  df-on 6338  df-lim 6339  df-suc 6340  df-iota 6466  df-fun 6515  df-fn 6516  df-f 6517  df-f1 6518  df-fo 6519  df-f1o 6520  df-fv 6521  df-ov 7392  df-om 7845  df-2nd 7971  df-frecs 8262  df-wrecs 8293  df-recs 8342  df-rdg 8380  df-r1 9723  df-rank 9724  df-relp 44926

This theorem is referenced by:  wffr  44944