Theorem 0map0sn0 8904

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

Step	Hyp	Ref	Expression
1		f0bi 6766	. . 3 ⊢ (𝑓:∅⟶∅ ↔ 𝑓 = ∅)
2	1	abbii 2803	. 2 ⊢ {𝑓 ∣ 𝑓:∅⟶∅} = {𝑓 ∣ 𝑓 = ∅}
3		0ex 5282	. . 3 ⊢ ∅ ∈ V
4	3, 3	mapval 8857	. 2 ⊢ (∅ ↑m ∅) = {𝑓 ∣ 𝑓:∅⟶∅}
5		df-sn 4607	. 2 ⊢ {∅} = {𝑓 ∣ 𝑓 = ∅}
6	2, 4, 5	3eqtr4i 2769	1 ⊢ (∅ ↑m ∅) = {∅}

Syntax hints:   = wceq 1540  {cab 2714  ∅c0 4313  {csn 4606  ⟶wf 6532  (class class class)co 7410   ↑_m cmap 8845

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-10 2142  ax-11 2158  ax-12 2178  ax-ext 2708  ax-sep 5271  ax-nul 5281  ax-pow 5340  ax-pr 5407  ax-un 7734

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2540  df-eu 2569  df-clab 2715  df-cleq 2728  df-clel 2810  df-nfc 2886  df-ral 3053  df-rex 3062  df-rab 3421  df-v 3466  df-sbc 3771  df-dif 3934  df-un 3936  df-in 3938  df-ss 3948  df-nul 4314  df-if 4506  df-pw 4582  df-sn 4607  df-pr 4609  df-op 4613  df-uni 4889  df-br 5125  df-opab 5187  df-id 5553  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-iota 6489  df-fun 6538  df-fn 6539  df-f 6540  df-fv 6544  df-ov 7413  df-oprab 7414  df-mpo 7415  df-map 8847

This theorem is referenced by:  efmndbas0  18874  symgvalstruct  19383  setc1ohomfval  49345  setc1ocofval  49346