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Theorem snmapen1 8584
Description: Set exponentiation: a singleton to any set is equinumerous to ordinal 1. (Proposed by BJ, 17-Jul-2022.) (Contributed by AV, 17-Jul-2022.)
Assertion
Ref Expression
snmapen1 ((𝐴𝑉𝐵𝑊) → ({𝐴} ↑m 𝐵) ≈ 1o)

Proof of Theorem snmapen1
StepHypRef Expression
1 snmapen 8583 . 2 ((𝐴𝑉𝐵𝑊) → ({𝐴} ↑m 𝐵) ≈ {𝐴})
2 ensn1g 8567 . . 3 (𝐴𝑉 → {𝐴} ≈ 1o)
32adantr 483 . 2 ((𝐴𝑉𝐵𝑊) → {𝐴} ≈ 1o)
4 entr 8554 . 2 ((({𝐴} ↑m 𝐵) ≈ {𝐴} ∧ {𝐴} ≈ 1o) → ({𝐴} ↑m 𝐵) ≈ 1o)
51, 3, 4syl2anc 586 1 ((𝐴𝑉𝐵𝑊) → ({𝐴} ↑m 𝐵) ≈ 1o)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 398  wcel 2113  {csn 4560   class class class wbr 5059  (class class class)co 7149  1oc1o 8088  m cmap 8399  cen 8499
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 1969  ax-7 2014  ax-8 2115  ax-9 2123  ax-10 2144  ax-11 2160  ax-12 2176  ax-ext 2792  ax-sep 5196  ax-nul 5203  ax-pow 5259  ax-pr 5323  ax-un 7454
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1084  df-tru 1539  df-ex 1780  df-nf 1784  df-sb 2069  df-mo 2621  df-eu 2653  df-clab 2799  df-cleq 2813  df-clel 2892  df-nfc 2962  df-ne 3016  df-ral 3142  df-rex 3143  df-rab 3146  df-v 3493  df-sbc 3769  df-csb 3877  df-dif 3932  df-un 3934  df-in 3936  df-ss 3945  df-nul 4285  df-if 4461  df-pw 4534  df-sn 4561  df-pr 4563  df-op 4567  df-uni 4832  df-br 5060  df-opab 5122  df-mpt 5140  df-id 5453  df-xp 5554  df-rel 5555  df-cnv 5556  df-co 5557  df-dm 5558  df-rn 5559  df-res 5560  df-ima 5561  df-suc 6190  df-iota 6307  df-fun 6350  df-fn 6351  df-f 6352  df-f1 6353  df-fo 6354  df-f1o 6355  df-fv 6356  df-ov 7152  df-oprab 7153  df-mpo 7154  df-1o 8095  df-er 8282  df-map 8401  df-en 8503
This theorem is referenced by:  map1  8585
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