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| abstraction > hypothesis > theory > unified theory > string theory > closed string | 
| closed string | ||||
| subject | fact | |||
| closed string | has definition A type of string that is in the shape of a loop. | ![]()  | 
| is a kind of string theory | ![]()  | |
| theory | has validity correct or incorrect with caveats | ![]()  | 
| has author or reasearch group | ![]()  | |
| has domain a field of research | ![]()  | |
| has date or a range of dates for which the theory was active | ![]()  |