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Theorem mgm0 13234
Description: Any set with an empty base set and any group operation is a magma. (Contributed by AV, 28-Aug-2021.)
Assertion
Ref Expression
mgm0  |-  ( ( M  e.  V  /\  ( Base `  M )  =  (/) )  ->  M  e. Mgm )

Proof of Theorem mgm0
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 rzal 3558 . . 3  |-  ( (
Base `  M )  =  (/)  ->  A. x  e.  ( Base `  M
) A. y  e.  ( Base `  M
) ( x ( +g  `  M ) y )  e.  (
Base `  M )
)
21adantl 277 . 2  |-  ( ( M  e.  V  /\  ( Base `  M )  =  (/) )  ->  A. x  e.  ( Base `  M
) A. y  e.  ( Base `  M
) ( x ( +g  `  M ) y )  e.  (
Base `  M )
)
3 eqid 2205 . . . 4  |-  ( Base `  M )  =  (
Base `  M )
4 eqid 2205 . . . 4  |-  ( +g  `  M )  =  ( +g  `  M )
53, 4ismgm 13222 . . 3  |-  ( M  e.  V  ->  ( M  e. Mgm  <->  A. x  e.  (
Base `  M ) A. y  e.  ( Base `  M ) ( x ( +g  `  M
) y )  e.  ( Base `  M
) ) )
65adantr 276 . 2  |-  ( ( M  e.  V  /\  ( Base `  M )  =  (/) )  ->  ( M  e. Mgm  <->  A. x  e.  (
Base `  M ) A. y  e.  ( Base `  M ) ( x ( +g  `  M
) y )  e.  ( Base `  M
) ) )
72, 6mpbird 167 1  |-  ( ( M  e.  V  /\  ( Base `  M )  =  (/) )  ->  M  e. Mgm )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 104    <-> wb 105    = wceq 1373    e. wcel 2176   A.wral 2484   (/)c0 3460   ` cfv 5272  (class class class)co 5946   Basecbs 12865   +g cplusg 12942  Mgmcmgm 13219
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 615  ax-in2 616  ax-io 711  ax-5 1470  ax-7 1471  ax-gen 1472  ax-ie1 1516  ax-ie2 1517  ax-8 1527  ax-10 1528  ax-11 1529  ax-i12 1530  ax-bndl 1532  ax-4 1533  ax-17 1549  ax-i9 1553  ax-ial 1557  ax-i5r 1558  ax-13 2178  ax-14 2179  ax-ext 2187  ax-sep 4163  ax-pow 4219  ax-pr 4254  ax-un 4481  ax-cnex 8018  ax-resscn 8019  ax-1re 8021  ax-addrcl 8024
This theorem depends on definitions:  df-bi 117  df-3an 983  df-tru 1376  df-nf 1484  df-sb 1786  df-eu 2057  df-mo 2058  df-clab 2192  df-cleq 2198  df-clel 2201  df-nfc 2337  df-ne 2377  df-ral 2489  df-rex 2490  df-v 2774  df-sbc 2999  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3461  df-pw 3618  df-sn 3639  df-pr 3640  df-op 3642  df-uni 3851  df-int 3886  df-br 4046  df-opab 4107  df-mpt 4108  df-id 4341  df-xp 4682  df-rel 4683  df-cnv 4684  df-co 4685  df-dm 4686  df-rn 4687  df-res 4688  df-iota 5233  df-fun 5274  df-fn 5275  df-fv 5280  df-ov 5949  df-inn 9039  df-2 9097  df-ndx 12868  df-slot 12869  df-base 12871  df-plusg 12955  df-mgm 13221
This theorem is referenced by:  sgrp0  13275
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