Journal article

Trees for E

Shawn Standefer

LOGIC JOURNAL OF THE IGPL | OXFORD UNIV PRESS | Published : 2018

Abstract

A tree natural deduction system for Anderson and Belnap’s relevant logic E is presented and shown equivalent to a Hilbertstyle axiomatization of E. Using an idea from Prawitz, a variant tree system is motivated and shown equivalent to the Hilbertstyle system via a detour through Anderson and Belnap’s Fitch system for E.