Minimum weight shield synthesis for space vehicles

Minimum weight proton shield synthesis for space vehicle

Ordered groupoids and the holomorph of an inverse semigroup

We present a construction for the holomorph of an inverse semigroup, derived from the cartesian closed structure of the category of ordered groupoids. We compare the holomorph with the monoid of mappings that preserve the ternary heap operation on an inverse semigroup: for groups these two constructions coincide. We present detailed calculations for semilattices of groups and for the polycyclic monoids.Comment: 16 page

A solution of the neutron transport equation :

"Nuclear Development Associates, Inc., White Plains, New York.""Work performed under Contract AT(30-1)-862 with the United States Atomic Energy Commission.""May 31, 1955.""NYO-6260 ; NDA 15C-53.""This report distributed in accordance with TID-4500-Physics Category."Mode of access: Internet