English
Let f, g: N → C. The abscissa of absolute convergence of f + g is at most the maximum of the abscissas of f and g.
Русский
Пусть f, g: N → C. Абсцисса абсолютной сходимости суммы f + g не превосходит максимум абсцисс f и g.
LaTeX
$$$$ \operatorname{abscissaOfAbsConv}(f+g) \le \max\big(\operatorname{abscissaOfAbsConv}(f), \operatorname{abscissaOfAbsConv}(g)\big). $$$$
Lean4
/-- The abscissa of absolute convergence of `f + g` is at most the maximum of those
of `f` and `g`. -/
theorem abscissaOfAbsConv_add_le (f g : ℕ → ℂ) :
abscissaOfAbsConv (f + g) ≤ max (abscissaOfAbsConv f) (abscissaOfAbsConv g) :=
abscissaOfAbsConv_binop_le LSeriesSummable.add f g