English
If m ∈ FP(a.tail), then head(a) * m ∈ FP(a).
Русский
Если m ∈ FP(a.tail), то head(a) * m ∈ FP(a).
LaTeX
$$For h: m ∈ FP(a.tail), head(a) * m ∈ FP(a).$$
Lean4
/-- Constructor for `FP`. This is the preferred spelling over `FP.cons'`. -/
@[to_additive (attr := match_pattern, nolint defLemma) /--
Constructor for `FS`. This is the preferred spelling over `FS.cons'`. -/
]
abbrev cons : a.head * m ∈ FP a :=
FP.cons' a m h