arithmetic progression automata theory bit cantor space cauchy product cauchy sequence complex number complexity class exact sequence farey sequence fibonacci number finite set finite state machine formal language function space geometric progression group ring infinite set integer integer sequence limit of a sequence limit ordinal linear subspace logarithm look-and-say sequence mathematical analysis mathematics monotonic function natural number numerical digit partially ordered set permutation planetmath polynomial polynomial sequence real analysis recurrence relation sequence space shortlex order strict subsequence theoretical computer science thue-morse sequence topological space topology tuple vector space