In mathematics, the word ''eutactic'' may refer to:
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Eutactic lattice
In mathematics, a eutactic lattice (or eutactic form) is a lattice in Euclidean space whose minimal vectors form a eutactic star. This means they have a set of positive eutactic coefficients ''c'i'' such that (''v'', ''v'') = Σ' ...
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Eutactic star
In Euclidean geometry, a eutactic star is a geometrical figure in a Euclidean space. A star is a figure consisting of any number of opposing pairs of Euclidean vector, vectors (or arms) issuing from a central origin. A star is eutactic if it is th ...
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