There exists an uncountable set of pretabular extensions of the relevant logic R and each logic of this set is generated by a variety of finite height
Kazimierz Świrydowicz · Journal of Symbolic Logic · 2008
Abstract In Handbook of Philosophical Logic M. Dunn formulated a problem of describing pretabular extensions of relevant logics (cf. M. Dunn [1984], p. 211; M. Dunn, G. Restall [2002], p. 79). The main result of this paper is described in the title.