# Osculant

In mathematical invariant theory, the **osculant** or **tacinvariant** or **tact invariant** is an invariant of a hypersurface that vanishes if the hypersurface touches itself, or an invariant of several hypersurfaces that osculate, meaning that they have a common point where they meet to unusually high order.

## References

- Salmon, George (1885) [1859],
*Lessons introductory to the modern higher algebra*(4th ed.), Dublin, Hodges, Figgis, and Co., ISBN 978-0-8284-0150-0

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