English to math translations

[MacroQuantum]

At this site

http://www.ess.sunysb.edu/fwalter/AST101/habzone.html

he makes several statements which should yield two simple formulas. Those formulas being a Outer and Inner boundaries. My problem is in translating his english to math. As near as I can tell

I=(S^4/(1/L))*A

should determine the Inner boundary. Where S= The sun's temperature, L is equal to the lower end temperature of the planet (most likely at equator), and A is equal to the Albedo of the planet.

Likewise, as near as I can determine

O=(S^4/(1/U))

should determine the Outer boundary, where S = Sun's temperature and U is the upper end of the temperature range.

While I'm at it, anybody care to take a stab at ranges those distances are in? I'm not sure how a mile, or kilometer would translate to radii

Anybody care to doublecheck me?