Theorem ismonb2 10740

Description: If F "is a monomorphism" is cancelable when it is the left operand of a composition.

Hypotheses

Ref	Expression
ismonb2.1	|- M = dom (dom` T)
ismonb2.2	|- D = (dom` T)
ismonb2.3	|- C = (cod` T)
ismonb2.4	|- R = (o` T)

Assertion

Ref	Expression
ismonb2	|- ((T e. Cat /\ (F e. M /\ G e. M /\ J e. M)) -> (F e. (Monic` T) -> (((D` G) = (D` J) /\ (C` G) = (D` F) /\ (C` J) = (D` F)) -> ((FRG) = (FRJ) -> G = J))))

Proof of Theorem ismonb2

Step	Hyp	Ref	Expression
1		ismonb2.1	. . . 4 |- M = dom (dom` T)
2		ismonb2.2	. . . 4 |- D = (dom` T)
3		ismonb2.3	. . . 4 |- C = (cod` T)
4		ismonb2.4	. . . 4 |- R = (o` T)
5	1, 2, 3, 4	ismonb1 10739	. . 3 |- ((T e. Cat /\ F e. M) -> (F e. (Monic` T) <-> A.g e. M A.j e. M (((D` g) = (D` j) /\ (C` g) = (D` F) /\ (C` j) = (D` F)) -> ((FRg) = (FRj) -> g = j))))
6	5	3ad2antr1 812	. 2 |- ((T e. Cat /\ (F e. M /\ G e. M /\ J e. M)) -> (F e. (Monic` T) <-> A.g e. M A.j e. M (((D` g) = (D` j) /\ (C` g) = (D` F) /\ (C` j) = (D` F)) -> ((FRg) = (FRj) -> g = j))))
7		3simpc 787	. . . 4 |- ((F e. M /\ G e. M /\ J e. M) -> (G e. M /\ J e. M))
8	7	adantl 388	. . 3 |- ((T e. Cat /\ (F e. M /\ G e. M /\ J e. M)) -> (G e. M /\ J e. M))
9		fveq2 3724	. . . . . . 7 |- (g = G -> (D` g) = (D` G))
10	9	eqeq1d 1483	. . . . . 6 |- (g = G -> ((D` g) = (D` j) <-> (D` G) = (D` j)))
11		fveq2 3724	. . . . . . 7 |- (g = G -> (C` g) = (C` G))
12	11	eqeq1d 1483	. . . . . 6 |- (g = G -> ((C` g) = (D` F) <-> (C` G) = (D` F)))
13	10, 12	3anbi12d 894	. . . . 5 |- (g = G -> (((D` g) = (D` j) /\ (C` g) = (D` F) /\ (C` j) = (D` F)) <-> ((D` G) = (D` j) /\ (C` G) = (D` F) /\ (C` j) = (D` F))))
14		opreq2 3969	. . . . . . 7 |- (g = G -> (FRg) = (FRG))
15	14	eqeq1d 1483	. . . . . 6 |- (g = G -> ((FRg) = (FRj) <-> (FRG) = (FRj)))
16		eqeq1 1481	. . . . . 6 |- (g = G -> (g = j <-> G = j))
17	15, 16	imbi12d 626	. . . . 5 |- (g = G -> (((FRg) = (FRj) -> g = j) <-> ((FRG) = (FRj) -> G = j)))
18	13, 17	imbi12d 626	. . . 4 |- (g = G -> ((((D` g) = (D` j) /\ (C` g) = (D` F) /\ (C` j) = (D` F)) -> ((FRg) = (FRj) -> g = j)) <-> (((D` G) = (D` j) /\ (C` G) = (D` F) /\ (C` j) = (D` F)) -> ((FRG) = (FRj) -> G = j))))
19		fveq2 3724	. . . . . . 7 |- (j = J -> (D` j) = (D` J))
20	19	eqeq2d 1486	. . . . . 6 |- (j = J -> ((D` G) = (D` j) <-> (D` G) = (D` J)))
21		fveq2 3724	. . . . . . 7 |- (j = J -> (C` j) = (C` J))
22	21	eqeq1d 1483	. . . . . 6 |- (j = J -> ((C` j) = (D` F) <-> (C` J) = (D` F)))
23	20, 22	3anbi13d 895	. . . . 5 |- (j = J -> (((D` G) = (D` j) /\ (C` G) = (D` F) /\ (C` j) = (D` F)) <-> ((D` G) = (D` J) /\ (C` G) = (D` F) /\ (C` J) = (D` F))))
24		opreq2 3969	. . . . . . 7 |- (j = J -> (FRj) = (FRJ))
25	24	eqeq2d 1486	. . . . . 6 |- (j = J -> ((FRG) = (FRj) <-> (FRG) = (FRJ)))
26		eqeq2 1484	. . . . . 6 |- (j = J -> (G = j <-> G = J))
27	25, 26	imbi12d 626	. . . . 5 |- (j = J -> (((FRG) = (FRj) -> G = j) <-> ((FRG) = (FRJ) -> G = J)))
28	23, 27	imbi12d 626	. . . 4 |- (j = J -> ((((D` G) = (D` j) /\ (C` G) = (D` F) /\ (C` j) = (D` F)) -> ((FRG) = (FRj) -> G = j)) <-> (((D` G) = (D` J) /\ (C` G) = (D` F) /\ (C` J) = (D` F)) -> ((FRG) = (FRJ) -> G = J))))
29	18, 28	rcla42v 1880	. . 3 |- ((G e. M /\ J e. M) -> (A.g e. M A.j e. M (((D` g) = (D` j) /\ (C` g) = (D` F) /\ (C` j) = (D` F)) -> ((FRg) = (FRj) -> g = j)) -> (((D` G) = (D` J) /\ (C` G) = (D` F) /\ (C` J) = (D` F)) -> ((FRG) = (FRJ) -> G = J))))
30	8, 29	syl 10	. 2 |- ((T e. Cat /\ (F e. M /\ G e. M /\ J e. M)) -> (A.g e. M A.j e. M (((D` g) = (D` j) /\ (C` g) = (D` F) /\ (C` j) = (D` F)) -> ((FRg) = (FRj) -> g = j)) -> (((D` G) = (D` J) /\ (C` G) = (D` F) /\ (C` J) = (D` F)) -> ((FRG) = (FRJ) -> G = J))))
31	6, 30	sylbid 203	1 |- ((T e. Cat /\ (F e. M /\ G e. M /\ J e. M)) -> (F e. (Monic` T) -> (((D` G) = (D` J) /\ (C` G) = (D` F) /\ (C` J) = (D` F)) -> ((FRG) = (FRJ) -> G = J))))

Syntax hints:   -> wi 3   <-> wb 146   /\ wa 223   /\ w3a 775   = wceq 956   e. wcel 958  A.wral 1645  dom cdm 3170  ` cfv 3182  (class class class)co 3963  domcdom_ 10644  codccod_ 10645  oco_ 10647  Catccat 10685  Moniccmon 10732

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 962  ax-gen 963  ax-8 964  ax-9 965  ax-10 966  ax-11 967  ax-12 968  ax-13 969  ax-14 970  ax-17 971  ax-4 973  ax-5o 975  ax-6o 978  ax-9o 1123  ax-10o 1140  ax-16 1210  ax-11o 1218  ax-ext 1459  ax-sep 2703  ax-pow 2742  ax-pr 2779  ax-un 2866

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-3an 777  df-ex 981  df-sb 1172  df-eu 1382  df-mo 1383  df-clab 1464  df-cleq 1469  df-clel 1472  df-ne 1587  df-ral 1649  df-rex 1650  df-v 1812  df-dif 2049  df-un 2050  df-in 2051  df-ss 2053  df-nul 2281  df-pw 2402  df-sn 2412  df-pr 2413  df-op 2416  df-uni 2504  df-br 2620  df-opab 2667  df-id 2835  df-xp 3184  df-rel 3185  df-cnv 3186  df-co 3187  df-dm 3188  df-rn 3189  df-res 3190  df-ima 3191  df-fun 3192  df-fv 3198  df-opr 3965  df-mon 10734

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