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Petrovsky lacuna

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Petrovsky lacuna

In mathematics, a Petrovsky lacuna, named for the Russian mathematician I. G. Petrovsky, is a region where the fundamental solution of a linear hyperbolic partial differential equation vanishes. They were studied by Petrovsky (1945) who found topological conditions for their existence.

Petrovsky's work was generalized and updated by Atiyah, Bott, and GĂ„rding (1970, 1973).

References

Petrovsky lacuna Wikipedia