# American Institute of Mathematical Sciences

May  2010, 27(2): 657-691. doi: 10.3934/dcds.2010.27.657

## The Pullback equation for degenerate forms

 1 Department of Mathematical Sciences, IISER Kolkata, Mohanpur Campus, PO: BCKV Campus Main Office, Mohanpur - 741252, West Bengal, India 2 Section de Mathématiques, Station 8, EPFL, 1015 Lausanne, Switzerland, Switzerland

Received  October 2009 Revised  February 2010 Published  February 2010

We discuss the existence of a diffeomorphism $\varphi:\mathbb{R} ^{n}\rightarrow\mathbb{R}^{n}$ such that

φ (g) =f,

where $f,g:\mathbb{R}^{n}\rightarrow\Lambda^{k}$ are closed differential forms and $2\leq k\leq n-1.$

Citation: Saugata Bandyopadhyay, Bernard Dacorogna, Olivier Kneuss. The Pullback equation for degenerate forms. Discrete & Continuous Dynamical Systems - A, 2010, 27 (2) : 657-691. doi: 10.3934/dcds.2010.27.657
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