Theorem refrelid 38498

Description: Identity relation is reflexive. (Contributed by Peter Mazsa, 25-Jul-2021.)

Assertion

Ref	Expression
refrelid	⊢ RefRel I

Proof of Theorem refrelid

Step	Hyp	Ref	Expression
1		ssid 3960	. 2 ⊢ ( I ∩ (dom I × ran I )) ⊆ ( I ∩ (dom I × ran I ))
2		reli 5773	. 2 ⊢ Rel I
3		df-refrel 38488	. 2 ⊢ ( RefRel I ↔ (( I ∩ (dom I × ran I )) ⊆ ( I ∩ (dom I × ran I )) ∧ Rel I ))
4	1, 2, 3	mpbir2an 711	1 ⊢ RefRel I

Syntax hints:   ∩ cin 3904   ⊆ wss 3905   I cid 5517   × cxp 5621  dom cdm 5623  ran crn 5624  Rel wrel 5628   RefRel wrefrel 38160

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-ext 2701

This theorem depends on definitions:  df-bi 207  df-an 396  df-tru 1543  df-ex 1780  df-sb 2066  df-clab 2708  df-cleq 2721  df-clel 2803  df-v 3440  df-ss 3922  df-opab 5158  df-id 5518  df-xp 5629  df-rel 5630  df-refrel 38488

This theorem is referenced by: (None)