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Theorem pet0 39253
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 39252 . 2 (( Disj ∅ ∧ (dom ∅ / ∅) = 𝐴) ↔ ( EqvRel ≀ ∅ ∧ (dom ≀ ∅ / ≀ ∅) = 𝐴))
2 dfpart2 39207 . 2 (∅ Part 𝐴 ↔ ( Disj ∅ ∧ (dom ∅ / ∅) = 𝐴))
3 dferALTV2 39088 . 2 ( ≀ ∅ ErALTV 𝐴 ↔ ( EqvRel ≀ ∅ ∧ (dom ≀ ∅ / ≀ ∅) = 𝐴))
41, 2, 33bitr4i 303 1 (∅ Part 𝐴 ↔ ≀ ∅ ErALTV 𝐴)
Colors of variables: wff setvar class
Syntax hints:  wb 206  wa 395   = wceq 1542  c0 4274  dom cdm 5624   / cqs 8635  ccoss 38518   EqvRel weqvrel 38535   ErALTV werALTV 38544   Disj wdisjALTV 38554   Part wpart 38559
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-10 2147  ax-11 2163  ax-12 2185  ax-ext 2709  ax-sep 5231  ax-pr 5370
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-nf 1786  df-sb 2069  df-mo 2540  df-eu 2570  df-clab 2716  df-cleq 2729  df-clel 2812  df-nfc 2886  df-ral 3053  df-rex 3063  df-rmo 3343  df-rab 3391  df-v 3432  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4275  df-if 4468  df-sn 4569  df-pr 4571  df-op 4575  df-br 5087  df-opab 5149  df-id 5519  df-xp 5630  df-rel 5631  df-cnv 5632  df-co 5633  df-dm 5634  df-rn 5635  df-res 5636  df-ima 5637  df-ec 8638  df-qs 8642  df-coss 38836  df-refrel 38927  df-cnvrefrel 38942  df-symrel 38959  df-trrel 38993  df-eqvrel 39004  df-dmqs 39058  df-erALTV 39084  df-disjALTV 39125  df-part 39204
This theorem is referenced by: (None)
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