latHtEEqn :: Relation
latHtEEqn = apply1 latentHeat time $= 
  defint (eqSymb tau) 0 (sy time) (deriv (apply1 latentHeat tau) tau)
latHtEEqn :: Relation
latHtEEqn = apply1 latentHeat time $= 
  defint (eqSymb tau) 0 (sy time) (deriv (apply1 latentHeat tau) tau)
latHtEEqn = apply1 latentHeat time $= 
  defint (eqSymb tau) 0 (sy time) (deriv (apply1 latentHeat tau) tau)