DROP OPERATOR IF EXISTS @= (mol, mol);

CREATE OPERATOR @= (
    LEFTARG = mol,
    RIGHTARG = mol,
    PROCEDURE = mol_eq,
    COMMUTATOR = '@=',
    NEGATOR = '@<>',
    RESTRICT = eqsel,
    JOIN = eqjoinsel
);

DROP OPERATOR IF EXISTS @= (reaction, reaction);

CREATE OPERATOR @= (
    LEFTARG = reaction,
    RIGHTARG = reaction,
    PROCEDURE = reaction_eq,
    COMMUTATOR = '@=',
    NEGATOR = '@<>',
    RESTRICT = eqsel,
    JOIN = eqjoinsel
);
