> conditional logic Conditional logic can be expressed in terms of arithmetic: if c then t else f = c*t + (1-c)*f You can also do boolean logic: NOT y =

> conditional logic Conditional logic can be expressed in terms of arithmetic: if c then t else f = c*t + (1-c)*f You can also do boolean logic: NOT y = 1 - y x AND y = x * y x OR y = (x + y) - (x * y) (Where 1 indicates truth and 0 falsity.) What you can't do, however, is conditional execution, as this would leak information. Which doesn't limit the capabilities of the system in principle, but does in practice because this harms performance. E.G. ‘select count(*) from users where name = bob’ will be much slower with HFE than with a traditional database because there will be no possibility of using precalculated indices.