Obviously is closed, since any sequence which appears in appears in every , and therefore its limit is also in every .
Direct current | no limit | direct current | direct action | term limit | Turbocharged Direct Injection | High-voltage direct current | Direct marketing | No Limit Records | Limit of a sequence | Joint Direct Attack Munition | Direct memory access | Vertical Limit | Portsmouth Direct Line | National Academy of Direct Taxes | International direct dialing | Time limit | Supporters Direct | Speed limit | Saab Direct Ignition | Memphis: Direct from Broadway | Direct-response marketing | Direct reduced iron | Direct Metal Laser Sintering | Direct metal laser sintering | direct marketing | Direct Factory Outlets | direct democracy | Direct-broadcast satellite | Chandrasekhar limit |
Taking the direct limit of these groups and inclusions yields the stable mapping class group, whose rational cohomology ring was conjectured by David Mumford (one of conjectures called the Mumford conjectures).