$$\omega$$ $$\omega \prime$$ $${\omega }^{\prime }$$ $$\overrightarrow{\omega }$$ $$\stackrel{\prime }{\omega }\to$$ $$\overrightarrow{\omega }\prime$$ $${\overrightarrow{\omega }}^{\prime }$$ $$\overrightarrow{{\omega }^{\prime }}$$