A materials scientist is studying the symmetry of molecular arrangements in a self-healing material. The arrangement has a rotational symmetry group isomorphic to the dihedral group \(D_4\). How many distinct vectors \(\mathbf{v} = egin{pmatrix} x \ y \end{pmatrix}\) in \(\mathbb{R}^2\) with integer components satisfy \( \mathbf{v} \cdot \mathbf{v} = 10 \) and are invariant under a \(90^\circ\) rotation about the origin?

Tue, 05 May 2026 17:21:52 +0000

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