Existence axioms in subtheories of ZFC and related axiomatic systems
The tableaux method applied to a quasi-modulated logic for the quantifier "few"
Applications of infinitary combinatorics in Banach Spaces of the forms $C(K)$, $C(...
Arbitrariness and definability in the context of non-classical logics
Arbitrariness and genericity: or on how to speak of the unspeakable