General double linkage of Gorenstein algebras is defined. Rigidity, genericity, and regularity up to codimension six all pass across general double linkage. Rigid strongly unobstructed codimension four Gorenstein algebras which lie in different Herzog classes are produced.
Transactions of the American Mathematical Society, Volume 284, Issue 2, 1984, pages 501-534.
© 1984 by American Mathematical Society