File: logic_basic.sig

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/*
 * This file defines encodings for the logical symbols in a 
 * first-order logic. 
 */

sig  logic_basic.

accum_sig  logic_types.

/* Constants encoding the logical symbols; note the types of the 
generalized quantifiers */
type   perp    form.
type   tru     form.
type   (`and)     form -> form -> form.
type   (`or)      form -> form -> form.
type   (`imp)     form -> form -> form.
type   all     (term -> form) -> form.
type   some    (term -> form) -> form.