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Definition of Projectionless
1. Adjective. (mathematics of a C*-algebra) In which 0 and 1 are the only projections. ¹
¹ Source: wiktionary.com
|  | 
1. Adjective. (mathematics of a C*-algebra) In which 0 and 1 are the only projections. ¹
¹ Source: wiktionary.com