English
For an embedding f, independence in the mapped matroid is equivalent to independence in the preimage under f and the range condition I ⊆ range f.
Русский
Для вложения f независимость в перенесённом матроиде эквивалентна независимости в предобразе по f и условию I ⊆ range f.
LaTeX
$$$(M.mapEmbedding f).Indep I \\iff M.Indep (f^{-1}' I) \\wedge I \\subseteq \\operatorname{range} f$$$
Lean4
theorem mapEmbedding (hI : M.Indep I) (f : α ↪ β) : (M.mapEmbedding f).Indep (f '' I) := by
simpa [preimage_image_eq I f.injective]