Hypoellipticity of a second-order differential operator with quadratic form of variable sign (Q3778342)
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| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Hypoellipticity of a second-order differential operator with quadratic form of variable sign |
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Hypoellipticity of a second-order differential operator with quadratic form of variable sign (English)
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1986
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second order
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infinitely smooth coefficients
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alternating quadratic form
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