3 files changed, 83 insertions, 0 deletions
diff --git a/fp1/week4/mart/5.4.txt b/fp1/week4/mart/5.4.txt
new file mode 100644
index 0000000..50521d3
--- /dev/null
+++ b/fp1/week4/mart/5.4.txt
@@ -0,0 +1,4 @@
+1. 4+2 en 2+4. Dit geeft zelfde uitkomst ivm commutativiteit van +
+2. 4-2 en 2-4. Dit geeft 2 en -2. - is niet commutitatief.
+3. 4*2 en 2*4. Dit geeft zelfde uitkomst ivm commutativiteit van *
+4. 4/2 en 2/4. Dit geeft 2 en 0. / is niet commutitatief.
diff --git a/fp1/week4/mart/StdSet.dcl b/fp1/week4/mart/StdSet.dcl
new file mode 100644
index 0000000..0c702ca
--- /dev/null
+++ b/fp1/week4/mart/StdSet.dcl
@@ -0,0 +1,25 @@
+definition module StdSet
+
+import StdClass
+
+::	Set a
+
+toSet			:: [a]             -> Set a | Eq a
+fromSet			:: (Set a)         -> [a]
+
+isEmptySet		:: (Set a)         -> Bool
+isDisjoint		:: (Set a) (Set a) -> Bool  | Eq a
+isSubset		:: (Set a) (Set a) -> Bool  | Eq a
+isStrictSubset	:: (Set a) (Set a) -> Bool  | Eq a
+memberOfSet		:: a       (Set a) -> Bool  | Eq a
+union           :: (Set a) (Set a) -> Set a | Eq a
+intersection	:: (Set a) (Set a) -> Set a | Eq a
+nrOfElements	:: (Set a) -> Int
+without			:: (Set a) (Set a) -> Set a | Eq a
+
+product			:: (Set a) (Set b) -> Set (a,b)
+
+instance zero (Set a)
+instance ==   (Set a) | Eq a
+
+powerSet		:: (Set a)         -> Set (Set a) | Eq a
diff --git a/fp1/week4/mart/StdSet.icl b/fp1/week4/mart/StdSet.icl
new file mode 100644
index 0000000..ecb2e60
--- /dev/null
+++ b/fp1/week4/mart/StdSet.icl
@@ -0,0 +1,54 @@
+implementation module StdSet
+
+import StdEnv
+import StdClass
+
+::	Set a = Set [a]
+
+toSet	:: [a]             -> Set a | Eq a
+toSet s = Set (removeDup s)
+
+fromSet	:: (Set a)         -> [a]
+fromSet (Set s) = s
+
+isEmptySet	:: (Set a)         -> Bool
+isEmptySet s = isEmpty (fromSet s)
+
+isDisjoint	:: (Set a) (Set a) -> Bool  | Eq a
+isDisjoint s1 s2 = nrOfElements (intersection s1 s2) == 0
+
+isSubset	:: (Set a) (Set a) -> Bool  | Eq a
+isSubset s1 s2 = nrOfElements s1 == nrOfElements (intersection s1 s2)
+
+isStrictSubset	:: (Set a) (Set a) -> Bool  | Eq a
+isStrictSubset s1 s2 = isSubset s1 s2 && nrOfElements s1 < nrOfElements s2
+
+memberOfSet	:: a       (Set a) -> Bool  | Eq a
+memberOfSet a (Set []) = False
+memberOfSet a (Set [x:xs]) = a == x || memberOfSet a (Set xs)
+
+union	:: (Set a) (Set a) -> Set a | Eq a
+union (Set s1) (Set s2) = toSet (s1 ++ s2)
+
+intersection	:: (Set a) (Set a) -> Set a | Eq a
+intersection (Set s1) s2 = Set [e \\ e <- s1 | memberOfSet e s2]
+
+nrOfElements	:: (Set a) -> Int
+nrOfElements s = length (fromSet s)
+
+without	:: (Set a) (Set a) -> Set a | Eq a
+without (Set s1) s2 = Set [e \\ e <- s1 | not (memberOfSet e s2)]
+
+product	:: (Set a) (Set b) -> Set (a,b)
+product (Set s1) (Set s2) = Set [(e1, e2) \\ e1 <- s1, e2 <- s2]
+
+instance zero (Set a)
+where zero = Set []
+
+instance == (Set a) | Eq a
+where (==) s1 s2 = isSubset s1 s2 && isSubset s2 s1
+
+powerSet	:: (Set a)         -> Set (Set a) | Eq a
+powerSet (Set []) = Set [(Set [])]
+powerSet (Set [e:xs]) = union (powerSet (Set xs))
+	(Set [union (Set [e]) x \\ x <- fromSet (powerSet (Set xs))])