clarification

Author: gz101

lec_03_computation.md

@@ -339,7 +339,7 @@ This suggests that we can use $AND$, $OR$, and $NOT$ as our "basic operations",
 
 
 ::: {.quote}
-__Semi-formal definition of an algorithm:__ An _algorithm_ consists of a sequence of steps of the form "compute a new value by applying $AND$, $OR$, or $NOT$ to previously computed values".
+__Semi-formal definition of an algorithm:__ An _algorithm_ consists of a sequence of steps of the form "compute a new value by applying $AND$, $OR$, or $NOT$ to previously computed values (assuming that the input was also previously computed)".
 
 An algorithm $A$ _computes_ a function $F$ if for every input $x$ to $F$, if we feed $x$ as input to the algorithm, the value computed in its last step is $F(x)$.
 :::