let mathd-algebra-478 = `!b:real h:real v:real.
    (&0 < b /\ &0 < h /\ &0 < v) /\
    (v = &1 / &3 * (b * h)) /\
    (b = &30) /\
    (h = &13 / &2)
==>
    (v = &65)
`;;