REFERRING to the review of Hilbert's “Grundlagen der Geometric,” on p. 394 of No. 2066 of NATURE (June 3), may I point out that the commutative law of addition can be proved without the help of any ...

Abstract: It is often convenient to consider the arguments of a switching function to be the components 0 or 1 of a vector. In order to investigate systematically the properties of switching functions ...

Abstract: In the mid 1990's, the morphological associative memory (MAM) was introduced as a distributive associative memory model. Since then several extensions of MAMs as well as applications in ...