Theorem dffunsALTV4 39846

Description: Alternate definition of the class of functions. For the 𝑋 axis and the 𝑌 axis you can convert the right side to {𝑓 ∈ Rels ∣ ∀𝑥₁∃*𝑦₁𝑥₁𝑓𝑦₁}. (Contributed by Peter Mazsa, 31-Aug-2021.)

Assertion

Ref	Expression
dffunsALTV4	⊢ FunsALTV = {𝑓 ∈ Rels ∣ ∀𝑢∃*𝑥 𝑢𝑓𝑥}

Distinct variable group:   𝑢,𝑓,𝑥

Proof of Theorem dffunsALTV4

Step	Hyp	Ref	Expression
1		dffunsALTV 39843	. 2 ⊢ FunsALTV = {𝑓 ∈ Rels ∣ ≀ 𝑓 ∈ CnvRefRels }
2		cosselcnvrefrels4 39695	. . 3 ⊢ ( ≀ 𝑓 ∈ CnvRefRels ↔ (∀𝑢∃*𝑥 𝑢𝑓𝑥 ∧ ≀ 𝑓 ∈ Rels ))
3		cosselrels 39650	. . . 4 ⊢ (𝑓 ∈ Rels → ≀ 𝑓 ∈ Rels )
4	3	biantrud 541	. . 3 ⊢ (𝑓 ∈ Rels → (∀𝑢∃*𝑥 𝑢𝑓𝑥 ↔ (∀𝑢∃*𝑥 𝑢𝑓𝑥 ∧ ≀ 𝑓 ∈ Rels )))
5	2, 4	bitr4id 293	. 2 ⊢ (𝑓 ∈ Rels → ( ≀ 𝑓 ∈ CnvRefRels ↔ ∀𝑢∃*𝑥 𝑢𝑓𝑥))
6	1, 5	rabimbieq 39328	1 ⊢ FunsALTV = {𝑓 ∈ Rels ∣ ∀𝑢∃*𝑥 𝑢𝑓𝑥}

This proof depends on syntax axioms:   ∧ wa 401  ∀wal 1567   = wceq 1569   ∈ wcel 2146  ∃*wmo 2565  {crab 3416   class class class wbr 5106   ≀ ccoss 39258   Rels crels 39260   CnvRefRels ccnvrefrels 39266   FunsALTV cfunsALTV 39290

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5252  ax-pow 5331  ax-pr 5395  ax-un 7761

This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-mo 2567  df-clab 2742  df-cleq 2755  df-clel 2839  df-nfc 2913  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-rels 39515  df-coss 39576  df-ssr 39653  df-cnvrefs 39680  df-cnvrefrels 39681  df-funss 39840  df-funsALTV 39841

This theorem is used by:  dffunsALTV5  39847