In the paper "The Algebra of Topology" (Annals of Mathematics, 45, 1944), McKinsey and Tarski proposed derivative algebras (p183) to define the derive set in topology as follows.
Suppose $K$ is a Boolean algebra, $D$ is an operator in $K$ and $x,y\in K$. A derivative algebra satisfies the following axioms:
- $D(x)$ is closed in $K$.
- $DD(x) \leq D(x)$
- $D(x+y)=D(x)+D(y)$
- $D(0)=0$
I wonder if this is the first time that the term derivative algebras appeared (formally) in literature.