= Tetrahedral three-Skyrmion
{title2=$B=3$}
The familiar low-energy $B=3$ <Skyrmion> has tetrahedral baryon-density symmetry $T_d$. Proper rotations form the <tetrahedral symmetry> group $T\cong A_4$, acting on the field with compensating <isorotations>. An angular approximation is $R(z)=(i\sqrt3z^2-1)/(z^3-i\sqrt3z)$. Its <Wronskian of a rational map> is proportional to $z^4+2i\sqrt3z^2+1$. The four branch directions are the face-hole directions of a tetrahedral shell. A <rational map> and a variational radial profile approximate the actual field, and baryon-density symmetry must be distinguished from invariance of the <pion> field under an unaccompanied spatial rotation.
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