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Theorem mapm 6974
Description: Set exponentiation is inhabited if the base is inhabited. (Contributed by Jim Kingdon, 13-Oct-2026.)
Assertion
Ref Expression
mapm  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  E. x  x  e.  ( A  ^m  B
) )
Distinct variable groups:    x, A    x, B    x, C
Allowed substitution hints:    V( x)    W( x)

Proof of Theorem mapm
StepHypRef Expression
1 fconstg 5592 . . . . 5  |-  ( C  e.  A  ->  ( B  X.  { C }
) : B --> { C } )
213ad2ant3 1051 . . . 4  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  ( B  X.  { C } ) : B --> { C } )
3 simp3 1030 . . . . 5  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  C  e.  A )
43snssd 3860 . . . 4  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  { C }  C_  A )
52, 4fssd 5550 . . 3  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  ( B  X.  { C } ) : B --> A )
6 simp1 1028 . . . 4  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  A  e.  V )
7 simp2 1029 . . . 4  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  B  e.  W )
86, 7elmapd 6940 . . 3  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  ( ( B  X.  { C } )  e.  ( A  ^m  B
)  <->  ( B  X.  { C } ) : B --> A ) )
95, 8mpbird 167 . 2  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  ( B  X.  { C } )  e.  ( A  ^m  B ) )
10 elex2 2838 . 2  |-  ( ( B  X.  { C } )  e.  ( A  ^m  B )  ->  E. x  x  e.  ( A  ^m  B
) )
119, 10syl 14 1  |-  ( ( A  e.  V  /\  B  e.  W  /\  C  e.  A )  ->  E. x  x  e.  ( A  ^m  B
) )
Colors of variables:    wff set class
This proof depends on syntax axioms:    -> wi 4    /\ w3a 1009   E.wex 1545    e. wcel 2209   {csn 3709    X. cxp 4774   -->wf 5376  (class class class)co 6088    ^m cmap 6926
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4251  ax-pow 4313  ax-pr 4348  ax-un 4580  ax-setind 4686
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ne 2421  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-iota 5340  df-fun 5382  df-fn 5383  df-f 5384  df-fv 5388  df-ov 6091  df-oprab 6092  df-mpo 6093  df-map 6928
This theorem is used by: (None)
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