Trees for E
Shawn Standefer · Logic Journal of IGPL · 2018
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.