Theorem rankrelp 45534

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 9754	. 2 ⊢ rank:∪ (𝑅1 “ On)⟶On
2		rankelb 9784	. . . . 5 ⊢ (𝑦 ∈ ∪ (𝑅1 “ On) → (𝑥 ∈ 𝑦 → (rank‘𝑥) ∈ (rank‘𝑦)))
3		epel 5555	. . . . 5 ⊢ (𝑥 E 𝑦 ↔ 𝑥 ∈ 𝑦)
4		fvex 6884	. . . . . 6 ⊢ (rank‘𝑦) ∈ V
5	4	epeli 5554	. . . . 5 ⊢ ((rank‘𝑥) E (rank‘𝑦) ↔ (rank‘𝑥) ∈ (rank‘𝑦))
6	2, 3, 5	3imtr4g 299	. . . 4 ⊢ (𝑦 ∈ ∪ (𝑅1 “ On) → (𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦)))
7	6	rgen 3081	. . 3 ⊢ ∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))
8	7	rgenw 3083	. 2 ⊢ ∀𝑥 ∈ ∪ (𝑅1 “ On)∀𝑦 ∈ ∪ (𝑅1 “ On)(𝑥 E 𝑦 → (rank‘𝑥) E (rank‘𝑦))
9		df-relp 45517	. 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 723	1 ⊢ rank RelPres E , E (∪ (𝑅1 “ On), On)

Syntax hints:   → wi 4   ∈ wcel 2145  ∀wral 3079  ∪ cuni 4868   class class class wbr 5105   E cep 5551   “ cima 5655  Oncon0 6350  ⟶wf 6521  ‘cfv 6525  𝑅₁cr1 9722  rankcrnk 9723   RelPres wrelp 45516

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2737  ax-sep 5251  ax-nul 5261  ax-pow 5327  ax-pr 5395  ax-un 7722

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-nf 1807  df-sb 2094  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-ral 3080  df-rex 3090  df-reu 3371  df-rab 3418  df-v 3459  df-sbc 3748  df-csb 3856  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-pss 3927  df-nul 4289  df-if 4484  df-pw 4560  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4869  df-int 4909  df-iun 4954  df-br 5106  df-opab 5168  df-mpt 5187  df-tr 5213  df-id 5547  df-eprel 5552  df-po 5560  df-so 5561  df-fr 5605  df-we 5607  df-xp 5658  df-rel 5659  df-cnv 5660  df-co 5661  df-dm 5662  df-rn 5663  df-res 5664  df-ima 5665  df-pred 6292  df-ord 6353  df-on 6354  df-lim 6355  df-suc 6356  df-iota 6481  df-fun 6527  df-fn 6528  df-f 6529  df-f1 6530  df-fo 6531  df-f1o 6532  df-fv 6533  df-ov 7403  df-om 7851  df-2nd 7975  df-frecs 8266  df-wrecs 8297  df-recs 8346  df-rdg 8385  df-r1 9724  df-rank 9725  df-relp 45517

This theorem is referenced by:  wffr  45535