In abstract algebra, restriction of scalars is a procedure of creating a module over a ring from a module over another ring, given a homomorphism between them. Intuitively speaking, the resulting module "remembers" less information than the initial one, hence the name.
Read more about Restriction Of Scalars: Definition, Interpretation As A Functor, The Case of Fields
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—Selma H. Fraiberg (20th century)