Theorem isnmgm 17246

Description: A condition for a structure not to be a magma. (Contributed by AV, 30-Jan-2020.) (Proof shortened by NM, 5-Feb-2020.)

Hypotheses

Ref	Expression
mgmcl.b	|- B = ( Base ` M )
mgmcl.o	|- .o. = ( +g ` M )

Assertion

Ref	Expression
isnmgm	|- ( ( X e. B /\ Y e. B /\ ( X .o. Y ) e/ B ) -> M e/ Mgm )

Proof of Theorem isnmgm

Step	Hyp	Ref	Expression
1		mgmcl.b	. . . . . 6 |- B = ( Base ` M )
2		mgmcl.o	. . . . . 6 |- .o. = ( +g ` M )
3	1, 2	mgmcl 17245	. . . . 5 |- ( ( M e. Mgm /\ X e. B /\ Y e. B ) -> ( X .o. Y ) e. B )
4	3	3expib 1268	. . . 4 |- ( M e. Mgm -> ( ( X e. B /\ Y e. B ) -> ( X .o. Y ) e. B ) )
5	4	com12 32	. . 3 |- ( ( X e. B /\ Y e. B ) -> ( M e. Mgm -> ( X .o. Y ) e. B ) )
6	5	nelcon3d 2909	. 2 |- ( ( X e. B /\ Y e. B ) -> ( ( X .o. Y ) e/ B -> M e/ Mgm ) )
7	6	3impia 1261	1 |- ( ( X e. B /\ Y e. B /\ ( X .o. Y ) e/ B ) -> M e/ Mgm )

Syntax hints:   -> wi 4   /\ wa 384   /\ w3a 1037   = wceq 1483   e. wcel 1990   e/ wnel 2897   ` cfv 5888  (class class class)co 6650   Basecbs 15857   +g cplusg 15941  Mgmcmgm 17240

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-nul 4789

This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-nel 2898  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-sbc 3436  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-uni 4437  df-br 4654  df-iota 5851  df-fv 5896  df-ov 6653  df-mgm 17242

This theorem is referenced by:  oddinmgm  41815