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Unpublished Notes

 

5)  Calculus lemma:  Smooth functions vanishing on a submanifold

 

4)   Stable submanifolds of Pfaffian systems

 

3)  Chong-Kyu Han,  Finiteness of multi-contact maps for 2n vector fields on R^{2n+1},  preprint, presented in Banff conference of CR geometry, May 2006,     PDF

 

2)  Frobenius theorem with singular torsions

 

1) Infinitesimal Iosmetries on (M^2, g)