English
The domain of evaluation of multivariate power series forms an ideal in the space of functions, closed under addition and scalar multiplication by HasEval.
Русский
Область оценки многовекторных степенных рядов образует идеал в пространстве функций, замкнутый по сложению и умножению на HasEval.
LaTeX
$$$\\text{hasEvalIdeal} := \\{ a : (\\sigma \\to S) \\mid HasEval a\\}$ with ideal operations$$
Lean4
/-- The domain of evaluation of `MvPowerSeries`, as an ideal -/
@[simps]
def hasEvalIdeal : Ideal (σ → S) where
carrier := {a | HasEval a}
add_mem' := HasEval.add
zero_mem' := HasEval.zero
smul_mem' := HasEval.mul_left