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How to restrict a quadratic form to a sublattice

If I have quadratic form, is there an easy way to find what the quadratic form is when restricted to a (finite index) sublattice?

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updated 5 years ago

FrédéricC gravatar image

How to restrict a quadratic form to a sublattice

If I have quadratic form, is there an easy way to find what the quadratic form is when restricted to a (finite index) sublattice?