Theorem trlsegvdeglem2 16385

Description: Lemma for trlsegvdeg . (Contributed by AV, 20-Feb-2021.)

Hypotheses

Ref	Expression
trlsegvdeg.v	|- V = (Vtx ` G )
trlsegvdeg.i	|- I = (iEdg ` G )
trlsegvdeg.f	|- ( ph -> Fun I )
trlsegvdeg.n	|- ( ph -> N e. ( 0..^ (♯ ` F ) ) )
trlsegvdeg.u	|- ( ph -> U e. V )
trlsegvdeg.w	|- ( ph -> F (Trails ` G ) P )
trlsegvdeg.vx	|- ( ph -> (Vtx ` X ) = V )
trlsegvdeg.vy	|- ( ph -> (Vtx ` Y ) = V )
trlsegvdeg.vz	|- ( ph -> (Vtx ` Z ) = V )
trlsegvdeg.ix	|- ( ph -> (iEdg ` X ) = ( I |` ( F " ( 0..^ N ) ) ) )
trlsegvdeg.iy	|- ( ph -> (iEdg ` Y ) = { <. ( F ` N ) , ( I ` ( F ` N ) ) >. } )
trlsegvdeg.iz	|- ( ph -> (iEdg ` Z ) = ( I |` ( F " ( 0 ... N ) ) ) )

Assertion

Ref	Expression
trlsegvdeglem2	|- ( ph -> Fun (iEdg ` X ) )

Proof of Theorem trlsegvdeglem2

Step	Hyp	Ref	Expression
1		trlsegvdeg.f	. . 3 |- ( ph -> Fun I )
2	1	funresd 5375	. 2 |- ( ph -> Fun ( I |` ( F " ( 0..^ N ) ) ) )
3		trlsegvdeg.ix	. . 3 |- ( ph -> (iEdg ` X ) = ( I |` ( F " ( 0..^ N ) ) ) )
4	3	funeqd 5355	. 2 |- ( ph -> ( Fun (iEdg ` X ) <-> Fun ( I |` ( F " ( 0..^ N ) ) ) ) )
5	2, 4	mpbird 167	1 |- ( ph -> Fun (iEdg ` X ) )

Syntax hints:   -> wi 4   = wceq 1398   e. wcel 2202   {csn 3673   <.cop 3676   class class class wbr 4093   |` cres 4733   "cima 4734   Fun wfun 5327   ` cfv 5333  (class class class)co 6028   0cc0 8075   ...cfz 10288  ..^cfzo 10422  ♯chash 11083  Vtxcvtx 15936  iEdgciedg 15937  Trailsctrls 16304

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-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-ext 2213

This theorem depends on definitions:  df-bi 117  df-tru 1401  df-nf 1510  df-sb 1811  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-v 2805  df-in 3207  df-ss 3214  df-br 4094  df-opab 4156  df-rel 4738  df-cnv 4739  df-co 4740  df-res 4743  df-fun 5335

This theorem is referenced by:  trlsegvdegfi  16391