Idempotentsus (Estonian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Idempotentsus" in Estonian language version.

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George Grätzer (2003). General Lattice Theory. Basel: Birkhäuser. Here: Sect.1.2, p.5.

Valenza, Robert (2012). Linear Algebra: An Introduction to Abstract Mathematics. Berlin: Springer Science & Business Media. Lk 22. ISBN 9781461209010. An element s of a magma such that ss = s is called idempotent.
Doneddu, Alfred (1976). Polynômes et algèbre linéaire (prantsuse). Paris: Vuibert. Lk 180. Soit M un magma, noté multiplicativement. On nomme idempotent de M tout élément a de M tel que a² = a.