Equation Icon  6 10 2 −4∕3 23√E-−t 2 −1∕3 ∑ a′ 2 1∕6 16√E-−t∑ ¯a2 ds = − H (t) e dt + H (t) (dx ) + H (t)e (dx ). (10.66 ) a′=1 ¯a=7