English
If L/K is finite dimensional and K is complete, then L is complete with respect to the spectral-norm-induced uniform structure.
Русский
Если L/K конечномерно и K полноценно, то L является полным относительно униформной структуры, вызываемой спектральной нормой.
LaTeX
$$$\text{CompleteSpace}(L)\;\text{assuming}\; \text{CompleteSpace}(K)\;\text{and}\; \dim_K L < \infty$$$
Lean4
/-- If `L/K` is finite dimensional, then `L` is a complete space with respect to topology induced
by the spectral norm. -/
instance (priority := 100) completeSpace [CompleteSpace K] [h_fin : FiniteDimensional K L] :
@CompleteSpace L (uniformSpace K L) := by
letI := (normedAddCommGroup K L)
letI := (normedSpace K L)
exact FiniteDimensional.complete K L