ABSTRACT NESSY INDRYANTIKA. 2210247917, Construction of Derivation in Pseudo BE-Algebra, supervised by Sri Gemawati and Kartini. A BE-algebra is a non-empty set B with a binary operation ∗ and a constant 1, usually denoted by (B; ∗; 1), which satises the following axioms: (BE1) a ∗ a = 1, (BE2) a ∗ 1 = 1, (BE3) 1 ∗ a = a, and (BE4) a ∗ (b ∗ c) = b ∗ (a ∗ c) for all a; b…