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Theorem 0map0sn0 8944
Description: The set of mappings of the empty set to the empty set is the singleton containing the empty set. (Contributed by AV, 31-Mar-2024.)
Assertion
Ref Expression
0map0sn0 (∅ ↑m ∅) = {∅}

Proof of Theorem 0map0sn0
StepHypRef Expression
1 f0bi 6790 . . 3 (𝑓:∅⟶∅ ↔ 𝑓 = ∅)
21abbii 2830 . 2 {𝑓 ∣ 𝑓:∅⟶∅} = {𝑓 ∣ 𝑓 = ∅}
3 0ex 5265 . . 3 ∅ ∈ V
43, 3mapval 8889 . 2 (∅ ↑m ∅) = {𝑓 ∣ 𝑓:∅⟶∅}
5 df-sn 4589 . 2 {∅} = {𝑓 ∣ 𝑓 = ∅}
62, 4, 53eqtr4i 2796 1 (∅ ↑m ∅) = {∅}
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570  {cab 2741  ∅c0 4281  {csn 4588  ⟶wf 6557  (class class class)co 7446   ↑m cmap 8878
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-11 2197  ax-12 2216  ax-ext 2735  ax-sep 5253  ax-nul 5264  ax-pow 5332  ax-pr 5396  ax-un 7778
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  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-sbc 3743  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 5172  df-id 5551  df-xp 5662  df-rel 5663  df-cnv 5664  df-co 5665  df-dm 5666  df-rn 5667  df-iota 6515  df-fun 6563  df-fn 6564  df-f 6565  df-fv 6569  df-ov 7449  df-oprab 7450  df-mpo 7451  df-map 8880
This theorem is used by:  efmndbas0  19119  symgvalstruct  19644  setc1ohomfval  50843  setc1ocofval  50844
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