Geodesic
When a Sum of Idempotents or Projections is a Multiple of the Identity
Funkcionalʹnyj analiz i ego priloženiâ, Tome 34 (2000) no. 4, pp. 91-93.

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V. I. Rabanovich; Yu. S. Samoilenko. When a Sum of Idempotents or Projections is a Multiple of the Identity. Funkcionalʹnyj analiz i ego priloženiâ, Tome 34 (2000) no. 4, pp. 91-93. http://geodesic.mathdoc.fr/item/FAA_2000_34_4_a11/

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