25 citations · 84 across the 23 of their papers we have counts for
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math.DG2005★ 25 cited
Invariants of pseudogroup actions: Homological methods and Finiteness theorem
Boris Kruglikov, Valentin Lychagin
We study the equivalence problem of submanifolds with respect to a transitive pseudogroup action. The corresponding differential invariants are determined via formal theory and lea…
math.DG2005★ 2 cited
Spencer delta-cohomology, restrictions, characteristics and involutive symbolic PDEs
Boris Kruglikov, Valentin Lychagin
We generalize the notion of involutivity to systems of differential equations of different orders and show that the classical results due to Guillemin and Quillen relating involuti…