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Description: A walk as word corresponds to the sequence of vertices in a walk in a simple pseudograph. (Contributed by Alexander van der Vekens, 21-Jul-2018) (Revised by AV, 10-Apr-2021)
| Ref | Expression | ||
|---|---|---|---|
| Assertion | wlkiswwlks2 | ⊢ ( 𝐺 ∈ USPGraph → ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eqid | ⊢ ( Vtx ‘ 𝐺 ) = ( Vtx ‘ 𝐺 ) | |
| 2 | 1 | wwlkbp | ⊢ ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) → ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ) |
| 3 | eqid | ⊢ ( Edg ‘ 𝐺 ) = ( Edg ‘ 𝐺 ) | |
| 4 | 1 3 | iswwlks | ⊢ ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) ↔ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) |
| 5 | ovex | ⊢ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ∈ V | |
| 6 | mptexg | ⊢ ( ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ∈ V → ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ V ) | |
| 7 | 5 6 | mp1i | ⊢ ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) → ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ V ) |
| 8 | simprr | ⊢ ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) → 𝐺 ∈ USPGraph ) | |
| 9 | simplr | ⊢ ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) → 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) | |
| 10 | hashge1 | ⊢ ( ( 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ 𝑃 ≠ ∅ ) → 1 ≤ ( ♯ ‘ 𝑃 ) ) | |
| 11 | 10 | ancoms | ⊢ ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) → 1 ≤ ( ♯ ‘ 𝑃 ) ) |
| 12 | 11 | adantr | ⊢ ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) → 1 ≤ ( ♯ ‘ 𝑃 ) ) |
| 13 | 8 9 12 | 3jca | ⊢ ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) → ( 𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ 1 ≤ ( ♯ ‘ 𝑃 ) ) ) |
| 14 | 13 | adantr | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( 𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ 1 ≤ ( ♯ ‘ 𝑃 ) ) ) |
| 15 | edgval | ⊢ ( Edg ‘ 𝐺 ) = ran ( iEdg ‘ 𝐺 ) | |
| 16 | 15 | a1i | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( Edg ‘ 𝐺 ) = ran ( iEdg ‘ 𝐺 ) ) |
| 17 | 16 | eleq2d | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ↔ { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ran ( iEdg ‘ 𝐺 ) ) ) |
| 18 | 17 | ralbidv | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ↔ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ran ( iEdg ‘ 𝐺 ) ) ) |
| 19 | 18 | biimpd | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ran ( iEdg ‘ 𝐺 ) ) ) |
| 20 | eqid | ⊢ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) | |
| 21 | eqid | ⊢ ( iEdg ‘ 𝐺 ) = ( iEdg ‘ 𝐺 ) | |
| 22 | 20 21 | wlkiswwlks2lem6 | ⊢ ( ( 𝐺 ∈ USPGraph ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ 1 ≤ ( ♯ ‘ 𝑃 ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ran ( iEdg ‘ 𝐺 ) → ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 23 | 14 19 22 | sylsyld | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 24 | eleq1 | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ↔ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ Word dom ( iEdg ‘ 𝐺 ) ) ) | |
| 25 | fveq2 | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( ♯ ‘ 𝑓 ) = ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) | |
| 26 | 25 | oveq2d | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( 0 ... ( ♯ ‘ 𝑓 ) ) = ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ) |
| 27 | 26 | feq2d | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ↔ 𝑃 : ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ⟶ ( Vtx ‘ 𝐺 ) ) ) |
| 28 | 25 | oveq2d | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( 0 ..^ ( ♯ ‘ 𝑓 ) ) = ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ) |
| 29 | fveq1 | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( 𝑓 ‘ 𝑖 ) = ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) | |
| 30 | 29 | fveqeq2d | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ↔ ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) |
| 31 | 28 30 | raleqbidv | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ↔ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) |
| 32 | 24 27 31 | 3anbi123d | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ↔ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 33 | 32 | imbi2d | ⊢ ( 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) → ( ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ↔ ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) ) |
| 34 | 33 | adantl | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ↔ ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) ) |
| 35 | 23 34 | mpbird | ⊢ ( ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) ∧ 𝑓 = ( 𝑥 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) ↦ ( ◡ ( iEdg ‘ 𝐺 ) ‘ { ( 𝑃 ‘ 𝑥 ) , ( 𝑃 ‘ ( 𝑥 + 1 ) ) } ) ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 36 | 7 35 | spcimedv | ⊢ ( ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 37 | 36 | ex | ⊢ ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) → ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) ) |
| 38 | 37 | com23 | ⊢ ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) → ( ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) → ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) ) |
| 39 | 38 | 3impia | ⊢ ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) → ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ 𝐺 ∈ USPGraph ) → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 40 | 39 | expd | ⊢ ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) → ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) → ( 𝐺 ∈ USPGraph → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) ) |
| 41 | 40 | impcom | ⊢ ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) → ( 𝐺 ∈ USPGraph → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 42 | 41 | imp | ⊢ ( ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) ∧ 𝐺 ∈ USPGraph ) → ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) |
| 43 | uspgrupgr | ⊢ ( 𝐺 ∈ USPGraph → 𝐺 ∈ UPGraph ) | |
| 44 | 1 21 | upgriswlk | ⊢ ( 𝐺 ∈ UPGraph → ( 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ↔ ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 45 | 43 44 | syl | ⊢ ( 𝐺 ∈ USPGraph → ( 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ↔ ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 46 | 45 | adantl | ⊢ ( ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) ∧ 𝐺 ∈ USPGraph ) → ( 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ↔ ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 47 | 46 | exbidv | ⊢ ( ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) ∧ 𝐺 ∈ USPGraph ) → ( ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ↔ ∃ 𝑓 ( 𝑓 ∈ Word dom ( iEdg ‘ 𝐺 ) ∧ 𝑃 : ( 0 ... ( ♯ ‘ 𝑓 ) ) ⟶ ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ♯ ‘ 𝑓 ) ) ( ( iEdg ‘ 𝐺 ) ‘ ( 𝑓 ‘ 𝑖 ) ) = { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ) ) ) |
| 48 | 42 47 | mpbird | ⊢ ( ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) ∧ 𝐺 ∈ USPGraph ) → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) |
| 49 | 48 | ex | ⊢ ( ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) ∧ ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) ) → ( 𝐺 ∈ USPGraph → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) ) |
| 50 | 49 | ex | ⊢ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) → ( ( 𝑃 ≠ ∅ ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ∧ ∀ 𝑖 ∈ ( 0 ..^ ( ( ♯ ‘ 𝑃 ) − 1 ) ) { ( 𝑃 ‘ 𝑖 ) , ( 𝑃 ‘ ( 𝑖 + 1 ) ) } ∈ ( Edg ‘ 𝐺 ) ) → ( 𝐺 ∈ USPGraph → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) ) ) |
| 51 | 4 50 | biimtrid | ⊢ ( ( 𝐺 ∈ V ∧ 𝑃 ∈ Word ( Vtx ‘ 𝐺 ) ) → ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) → ( 𝐺 ∈ USPGraph → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) ) ) |
| 52 | 2 51 | mpcom | ⊢ ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) → ( 𝐺 ∈ USPGraph → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) ) |
| 53 | 52 | com12 | ⊢ ( 𝐺 ∈ USPGraph → ( 𝑃 ∈ ( WWalks ‘ 𝐺 ) → ∃ 𝑓 𝑓 ( Walks ‘ 𝐺 ) 𝑃 ) ) |