= Rigid circular string in four spatial dimensions
{title2=$X=A(t)\cos\sigma+B(t)\sin\sigma$}
If $A(t)$ and $B(t)$ are perpendicular four-dimensional spatial vectors of equal fixed magnitude, every constant-time slice is a planar circle. Opposite rotations in two orthogonal coordinate planes can produce a <Nambu–Goto action> solution with constant radius and a rotating plane. The <induced worldsheet metric> can be constant even though the embedding moves. Rotating Cartesian axes clarify its shape without removing its kinetic target-space energy.
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