contextFiniteSolutionSets.pl - Allows several common input forms for a finite solution set.
After setting the context to "FiniteSolutionSets", make an answer like:
Formula("1,2")
Formula("1/2,2/3,3/4")
Formula("sqrt(2),(1+sqrt(2))/3, -(sqrt(2)+3sqrt(5))/6")
List(Formula("1"))Note that if it is a singleton, the structure is different.
Then students can enter the answer in any number of ways. Like:
1,2
x=1,2
x=1,x=2
x=1 or 2
x=1 or x=2
{1,2}The "x" should be the only context variable, and it should be what the student needed to solve for.
If the answer is not submitted like {1,2}, and if the flag preferSetNotation is set to 1 (which is the default) then there is a message that this is the preferred form (but the student still gets credit).
Answers like 2/3 and (1+sqrt(2))/3 need to be in that form, so the problem author needs to be careful to not do things like Formula("1/2,$a/$b,3/4") where $a and $b have a nontrivial common divisor.
No decimals are allowed.