Geometric spaceability in sequence classes and operator ideals

Abstract This paper investigates advanced notions of lineability and spaceability within the frameworks of sequence spaces and operator ideals. We propose the notion of Standard Sequence Classes to provide an environment that unifies numerous classical sequence spaces while preserving their fundamental behavior. Utilizing this framework, we prove general $$(\alpha , \mathfrak {c})$$ ( α , c ) -spaceability results for complements of unions of (quasi-)Banach sequence spaces. These results extend the existing literature by addressing the challenging case where $$\alpha > 1$$ α > 1 and by encompassing the non-locally convex (quasi-)Banach setting. Furthermore, we provide criteria for the pointwise $$\mathfrak {c}$$ c -spaceability of differences between general components of operator ideals with values in standard sequence spaces. Our results recover and improve several known findings in the context of vector-valued sequences.