Lowest light-cone levels of an open bosonic string
= Lowest light-cone levels of an open bosonic string
{title2=$N=0,1,2$}
The first levels are the <oscillator vacuum>, $\alpha_{-1}^I|0\rangle$, and $\alpha_{-2}^I|0\rangle,\alpha_{-1}^I\alpha_{-1}^J|0\rangle$. At level two the transverse <vector representation> and <symmetric square> assemble into the massive <symmetric traceless square> of one extra rotation dimension.