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Theorem pet0 39285
Description: Class 𝐴 is a partition by the null class if and only if the cosets by the null class are in equivalence relation on it. (Contributed by Peter Mazsa, 31-Dec-2021.)
Assertion
Ref Expression
pet0 (∅ Part 𝐴 ↔ ≀ ∅ ErALTV 𝐴)

Proof of Theorem pet0
StepHypRef Expression
1 pet02 39284 . 2 (( Disj ∅ ∧ (dom ∅ / ∅) = 𝐴) ↔ ( EqvRel ≀ ∅ ∧ (dom ≀ ∅ / ≀ ∅) = 𝐴))
2 dfpart2 39239 . 2 (∅ Part 𝐴 ↔ ( Disj ∅ ∧ (dom ∅ / ∅) = 𝐴))
3 dferALTV2 39120 . 2 ( ≀ ∅ ErALTV 𝐴 ↔ ( EqvRel ≀ ∅ ∧ (dom ≀ ∅ / ≀ ∅) = 𝐴))
41, 2, 33bitr4i 304 1 (∅ Part 𝐴 ↔ ≀ ∅ ErALTV 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wb 207  wa 396   = wceq 1547  c0 4261  dom cdm 5618   / cqs 8632  ccoss 38550   EqvRel weqvrel 38567   ErALTV werALTV 38576   Disj wdisjALTV 38586   Part wpart 38591
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 2711  ax-sep 5218  ax-pr 5362
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  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 2718  df-cleq 2731  df-clel 2814  df-nfc 2888  df-ral 3054  df-rex 3064  df-rmo 3344  df-rab 3392  df-v 3433  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4262  df-if 4455  df-sn 4556  df-pr 4558  df-op 4562  df-br 5073  df-opab 5135  df-id 5513  df-xp 5624  df-rel 5625  df-cnv 5626  df-co 5627  df-dm 5628  df-rn 5629  df-res 5630  df-ima 5631  df-ec 8635  df-qs 8639  df-coss 38868  df-refrel 38959  df-cnvrefrel 38974  df-symrel 38991  df-trrel 39025  df-eqvrel 39036  df-dmqs 39090  df-erALTV 39116  df-disjALTV 39157  df-part 39236
This theorem is referenced by: (None)
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