English
For a fixed index set ι, the linear combination built from ones corresponds to a left tensor combination with finsuppScalarRight acting on the index set.
Русский
Для множества индексов ι линейная комбинация, построенная из единиц, эквивалентна левому тензорному сочетанию с finsuppScalarRight.
LaTeX
$$$ (linearCombination S ((1 : S) \\otimes_R v)).restrictScalars R = (linearCombination R v) \\circ (finsuppScalarRight R S ι)^{-1} $$$
Lean4
theorem linearCombination_one_tmul [DecidableEq ι] {v : ι → M} :
(linearCombination S ((1 : S) ⊗ₜ[R] v ·)).restrictScalars R =
(linearCombination R v).lTensor S ∘ₗ (finsuppScalarRight R S ι).symm :=
by ext; simp [smul_tmul']