Richard Herbert, 2nd Baron Herbert of Chirbury own son, another Edward, received his grandfather's books and most of his personal property. Herbert himself, the elder son, got only his father's horses and was instructed to "make much of the white horse", while his wife, the new Lady Herbert, was bequeathed her father-in-law's viols and lutes. He was briefly a member of the House of Lords, until on 19 March 1649 it was abolished by an Act of Parliament that declared that "The Commons of England find by too long experience that the House of Lords is useless and dangerous to the people of England". The Lords did
Useless rules change the language accepted by the grammar, nor does omitting the alternative "| "Ee"" from the right-hand side of the rule for "S". Hopcroft, et al. give an algorithm to eliminate useless rules from a context-free grammar. Aiken and Murphy give a fixpoint algorithm to detect which nonterminals of a given regular tree grammar are unproductive. Useless rules In theoretical computer science, in particular in the theory of formal languages, useless rules of a formal grammar are those rules of symbol production that are unreachable or unproductive, that is, that can or need never be applied. Given a context-free grammar,