# Fregean logics with the multiterm deduction theorem and their algebraization

@article{Czelakowski2004FregeanLW, title={Fregean logics with the multiterm deduction theorem and their algebraization}, author={Janusz Czelakowski and Don Pigozzi}, journal={Studia Logica}, year={2004}, volume={78}, pages={171-212} }

AbstractA deductive system
$$\mathcal{S}$$
(in the sense of Tarski) is Fregean if the relation of interderivability, relative to any given theory T, i.e., the binary relation between formulas
$$\{ \left\langle {\alpha ,\beta } \right\rangle :T,\alpha \vdash s \beta and T,\beta \vdash s \alpha \} ,$$
is a congruence relation on the formula algebra. The multiterm deduction-detachment theorem is a natural generalization of the deduction theorem of the classical and intuitionistic propositional…

## 25 Citations

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