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Theorem 1stf2 13983
Description: Value of the first projection on a morphism. (Contributed by Mario Carneiro, 11-Jan-2017.)
Hypotheses
Ref Expression
1stfval.t  |-  T  =  ( C  X.c  D )
1stfval.b  |-  B  =  ( Base `  T
)
1stfval.h  |-  H  =  (  Hom  `  T
)
1stfval.c  |-  ( ph  ->  C  e.  Cat )
1stfval.d  |-  ( ph  ->  D  e.  Cat )
1stfval.p  |-  P  =  ( C  1stF  D )
1stf1.p  |-  ( ph  ->  R  e.  B )
1stf2.p  |-  ( ph  ->  S  e.  B )
Assertion
Ref Expression
1stf2  |-  ( ph  ->  ( R ( 2nd `  P ) S )  =  ( 1st  |`  ( R H S ) ) )

Proof of Theorem 1stf2
Dummy variables  x  y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 1stfval.t . . . 4  |-  T  =  ( C  X.c  D )
2 1stfval.b . . . 4  |-  B  =  ( Base `  T
)
3 1stfval.h . . . 4  |-  H  =  (  Hom  `  T
)
4 1stfval.c . . . 4  |-  ( ph  ->  C  e.  Cat )
5 1stfval.d . . . 4  |-  ( ph  ->  D  e.  Cat )
6 1stfval.p . . . 4  |-  P  =  ( C  1stF  D )
71, 2, 3, 4, 5, 61stfval 13981 . . 3  |-  ( ph  ->  P  =  <. ( 1st  |`  B ) ,  ( x  e.  B ,  y  e.  B  |->  ( 1st  |`  (
x H y ) ) ) >. )
8 fo1st 6155 . . . . . 6  |-  1st : _V -onto-> _V
9 fofun 5468 . . . . . 6  |-  ( 1st
: _V -onto-> _V  ->  Fun 
1st )
108, 9ax-mp 8 . . . . 5  |-  Fun  1st
11 fvex 5555 . . . . . 6  |-  ( Base `  T )  e.  _V
122, 11eqeltri 2366 . . . . 5  |-  B  e. 
_V
13 resfunexg 5753 . . . . 5  |-  ( ( Fun  1st  /\  B  e. 
_V )  ->  ( 1st  |`  B )  e. 
_V )
1410, 12, 13mp2an 653 . . . 4  |-  ( 1st  |`  B )  e.  _V
1512, 12mpt2ex 6214 . . . 4  |-  ( x  e.  B ,  y  e.  B  |->  ( 1st  |`  ( x H y ) ) )  e. 
_V
1614, 15op2ndd 6147 . . 3  |-  ( P  =  <. ( 1st  |`  B ) ,  ( x  e.  B ,  y  e.  B  |->  ( 1st  |`  (
x H y ) ) ) >.  ->  ( 2nd `  P )  =  ( x  e.  B ,  y  e.  B  |->  ( 1st  |`  (
x H y ) ) ) )
177, 16syl 15 . 2  |-  ( ph  ->  ( 2nd `  P
)  =  ( x  e.  B ,  y  e.  B  |->  ( 1st  |`  ( x H y ) ) ) )
18 simprl 732 . . . 4  |-  ( (
ph  /\  ( x  =  R  /\  y  =  S ) )  ->  x  =  R )
19 simprr 733 . . . 4  |-  ( (
ph  /\  ( x  =  R  /\  y  =  S ) )  -> 
y  =  S )
2018, 19oveq12d 5892 . . 3  |-  ( (
ph  /\  ( x  =  R  /\  y  =  S ) )  -> 
( x H y )  =  ( R H S ) )
2120reseq2d 4971 . 2  |-  ( (
ph  /\  ( x  =  R  /\  y  =  S ) )  -> 
( 1st  |`  ( x H y ) )  =  ( 1st  |`  ( R H S ) ) )
22 1stf1.p . 2  |-  ( ph  ->  R  e.  B )
23 1stf2.p . 2  |-  ( ph  ->  S  e.  B )
24 ovex 5899 . . . 4  |-  ( R H S )  e. 
_V
25 resfunexg 5753 . . . 4  |-  ( ( Fun  1st  /\  ( R H S )  e. 
_V )  ->  ( 1st  |`  ( R H S ) )  e. 
_V )
2610, 24, 25mp2an 653 . . 3  |-  ( 1st  |`  ( R H S ) )  e.  _V
2726a1i 10 . 2  |-  ( ph  ->  ( 1st  |`  ( R H S ) )  e.  _V )
2817, 21, 22, 23, 27ovmpt2d 5991 1  |-  ( ph  ->  ( R ( 2nd `  P ) S )  =  ( 1st  |`  ( R H S ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    /\ wa 358    = wceq 1632    e. wcel 1696   _Vcvv 2801   <.cop 3656    |` cres 4707   Fun wfun 5265   -onto->wfo 5269   ` cfv 5271  (class class class)co 5874    e. cmpt2 5876   1stc1st 6136   2ndc2nd 6137   Basecbs 13164    Hom chom 13235   Catccat 13582    X.c cxpc 13958    1stF c1stf 13959
This theorem is referenced by:  1stfcl  13987  prf1st  13994  1st2ndprf  13996  uncf2  14027  diag12  14034  diag2  14035  yonedalem22  14068
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-rep 4147  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528  ax-cnex 8809  ax-resscn 8810  ax-1cn 8811  ax-icn 8812  ax-addcl 8813  ax-addrcl 8814  ax-mulcl 8815  ax-mulrcl 8816  ax-mulcom 8817  ax-addass 8818  ax-mulass 8819  ax-distr 8820  ax-i2m1 8821  ax-1ne0 8822  ax-1rid 8823  ax-rnegex 8824  ax-rrecex 8825  ax-cnre 8826  ax-pre-lttri 8827  ax-pre-lttrn 8828  ax-pre-ltadd 8829  ax-pre-mulgt0 8830
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-nel 2462  df-ral 2561  df-rex 2562  df-reu 2563  df-rab 2565  df-v 2803  df-sbc 3005  df-csb 3095  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-pss 3181  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-tp 3661  df-op 3662  df-uni 3844  df-int 3879  df-iun 3923  df-br 4040  df-opab 4094  df-mpt 4095  df-tr 4130  df-eprel 4321  df-id 4325  df-po 4330  df-so 4331  df-fr 4368  df-we 4370  df-ord 4411  df-on 4412  df-lim 4413  df-suc 4414  df-om 4673  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-res 4717  df-ima 4718  df-iota 5235  df-fun 5273  df-fn 5274  df-f 5275  df-f1 5276  df-fo 5277  df-f1o 5278  df-fv 5279  df-ov 5877  df-oprab 5878  df-mpt2 5879  df-1st 6138  df-2nd 6139  df-riota 6320  df-recs 6404  df-rdg 6439  df-1o 6495  df-oadd 6499  df-er 6676  df-en 6880  df-dom 6881  df-sdom 6882  df-fin 6883  df-pnf 8885  df-mnf 8886  df-xr 8887  df-ltxr 8888  df-le 8889  df-sub 9055  df-neg 9056  df-nn 9763  df-2 9820  df-3 9821  df-4 9822  df-5 9823  df-6 9824  df-7 9825  df-8 9826  df-9 9827  df-10 9828  df-n0 9982  df-z 10041  df-dec 10141  df-uz 10247  df-fz 10799  df-struct 13166  df-ndx 13167  df-slot 13168  df-base 13169  df-hom 13248  df-cco 13249  df-xpc 13962  df-1stf 13963
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