English
Same as 86454, reaffirmed: G ⊴ H iff there exists H' ⊆ H with an iso G ≅ H'.coe and H' induced.
Русский
То же самое, что и в 86454: G ⊴ H эквивалентно существованию H' ⊆ H с изоморфизмом G ≅ H'.coe и H' индуцирован.
LaTeX
$$G \subseteq_{\mathrm{ind}} H \iff \exists H' : H.Subgraph, \; \exists e : G \cong_g H'.coe, \; H'.IsInduced$$
Lean4
@[simp]
theorem copyCount_pos : 0 < G.copyCount H ↔ H ⊑ G := by
simp [copyCount, -nonempty_subtype, isContained_iff_exists_iso_subgraph, card_pos, filter_nonempty_iff]