Theorem istrl 29729

Description: Conditions for a pair of classes/functions to be a trail (in an undirected graph). (Contributed by Alexander van der Vekens, 20-Oct-2017.) (Revised by AV, 28-Dec-2020.) (Revised by AV, 29-Oct-2021.)

Assertion

Ref	Expression
istrl	⊢ (𝐹(Trails‘𝐺)𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹))

Proof of Theorem istrl

Dummy variables 𝑓 𝑝 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		trlsfval 29728	. 2 ⊢ (Trails‘𝐺) = {⟨𝑓, 𝑝⟩ ∣ (𝑓(Walks‘𝐺)𝑝 ∧ Fun ◡𝑓)}
2		cnveq 5887	. . . 4 ⊢ (𝑓 = 𝐹 → ◡𝑓 = ◡𝐹)
3	2	funeqd 6590	. . 3 ⊢ (𝑓 = 𝐹 → (Fun ◡𝑓 ↔ Fun ◡𝐹))
4	3	adantr 480	. 2 ⊢ ((𝑓 = 𝐹 ∧ 𝑝 = 𝑃) → (Fun ◡𝑓 ↔ Fun ◡𝐹))
5		relwlk 29659	. 2 ⊢ Rel (Walks‘𝐺)
6	1, 4, 5	brfvopabrbr 7013	1 ⊢ (𝐹(Trails‘𝐺)𝑃 ↔ (𝐹(Walks‘𝐺)𝑃 ∧ Fun ◡𝐹))

Syntax hints:   ↔ wb 206   ∧ wa 395   = wceq 1537   class class class wbr 5148  ^◡ccnv 5688  Fun wfun 6557  ‘cfv 6563  Walkscwlks 29629  Trailsctrls 29723

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1908  ax-6 1965  ax-7 2005  ax-8 2108  ax-9 2116  ax-10 2139  ax-11 2155  ax-12 2175  ax-ext 2706  ax-sep 5302  ax-nul 5312  ax-pr 5438

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1540  df-fal 1550  df-ex 1777  df-nf 1781  df-sb 2063  df-mo 2538  df-eu 2567  df-clab 2713  df-cleq 2727  df-clel 2814  df-nfc 2890  df-ne 2939  df-ral 3060  df-rex 3069  df-rab 3434  df-v 3480  df-sbc 3792  df-csb 3909  df-dif 3966  df-un 3968  df-in 3970  df-ss 3980  df-nul 4340  df-if 4532  df-sn 4632  df-pr 4634  df-op 4638  df-uni 4913  df-br 5149  df-opab 5211  df-mpt 5232  df-id 5583  df-xp 5695  df-rel 5696  df-cnv 5697  df-co 5698  df-dm 5699  df-rn 5700  df-res 5701  df-ima 5702  df-iota 6516  df-fun 6565  df-fv 6571  df-wlks 29632  df-trls 29725

This theorem is referenced by:  trliswlk  29730  trlf1  29731  trlres  29733  upgristrl  29735  2pthnloop  29764  upgrspthswlk  29771  uhgrwkspth  29788  usgr2wlkspth  29792  uspgrn2crct  29838  crctcshtrl  29853  2trld  29968  0trl  30151  1trld  30171  ntrl2v2e  30187  3trld  30201  iseupthf1o  30231  subgrtrl  35118