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| Mirrors > Home > ILE Home > Th. List > iedgval0 | GIF version | ||
| Description: Degenerated case 1 for edges: The set of indexed edges of the empty set is the empty set. (Contributed by AV, 24-Sep-2020.) |
| Ref | Expression |
|---|---|
| iedgval0 | ⊢ (iEdg‘∅) = ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nelxp 4759 | . . 3 ⊢ ¬ ∅ ∈ (V × V) | |
| 2 | 1 | iffalsei 3618 | . 2 ⊢ if(∅ ∈ (V × V), (2nd ‘∅), (.ef‘∅)) = (.ef‘∅) |
| 3 | 0ex 4221 | . . 3 ⊢ ∅ ∈ V | |
| 4 | iedgvalg 15941 | . . 3 ⊢ (∅ ∈ V → (iEdg‘∅) = if(∅ ∈ (V × V), (2nd ‘∅), (.ef‘∅))) | |
| 5 | 3, 4 | ax-mp 5 | . 2 ⊢ (iEdg‘∅) = if(∅ ∈ (V × V), (2nd ‘∅), (.ef‘∅)) |
| 6 | edgfid 15930 | . . . 4 ⊢ .ef = Slot (.ef‘ndx) | |
| 7 | edgfndxnn 15932 | . . . 4 ⊢ (.ef‘ndx) ∈ ℕ | |
| 8 | 6, 7 | ndxslid 13170 | . . 3 ⊢ (.ef = Slot (.ef‘ndx) ∧ (.ef‘ndx) ∈ ℕ) |
| 9 | 8 | strsl0 13194 | . 2 ⊢ ∅ = (.ef‘∅) |
| 10 | 2, 5, 9 | 3eqtr4i 2262 | 1 ⊢ (iEdg‘∅) = ∅ |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 ∈ wcel 2202 Vcvv 2803 ∅c0 3496 ifcif 3607 × cxp 4729 ‘cfv 5333 2nd c2nd 6311 ndxcnx 13142 .efcedgf 15928 iEdgciedg 15937 |
| 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-in1 619 ax-in2 620 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-13 2204 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-nul 4220 ax-pow 4270 ax-pr 4305 ax-un 4536 ax-setind 4641 ax-cnex 8166 ax-resscn 8167 ax-1cn 8168 ax-1re 8169 ax-icn 8170 ax-addcl 8171 ax-addrcl 8172 ax-mulcl 8173 ax-addcom 8175 ax-mulcom 8176 ax-addass 8177 ax-mulass 8178 ax-distr 8179 ax-i2m1 8180 ax-1rid 8182 ax-0id 8183 ax-rnegex 8184 ax-cnre 8186 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-ral 2516 df-rex 2517 df-reu 2518 df-rab 2520 df-v 2805 df-sbc 3033 df-csb 3129 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-nul 3497 df-if 3608 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-br 4094 df-opab 4156 df-mpt 4157 df-id 4396 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-rn 4742 df-res 4743 df-iota 5293 df-fun 5335 df-fn 5336 df-f 5337 df-fo 5339 df-fv 5341 df-riota 5981 df-ov 6031 df-oprab 6032 df-mpo 6033 df-2nd 6313 df-sub 8394 df-inn 9186 df-2 9244 df-3 9245 df-4 9246 df-5 9247 df-6 9248 df-7 9249 df-8 9250 df-9 9251 df-n0 9445 df-dec 9656 df-ndx 13148 df-slot 13149 df-edgf 15929 df-iedg 15939 |
| This theorem is referenced by: uhgr0 16009 usgr0 16163 0grsubgr 16188 |
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