3 files changed, 22 insertions, 5 deletions
diff --git a/Homeworks.md b/Homeworks.md
index 1aefcb4..f730c5f 100644
--- a/Homeworks.md
+++ b/Homeworks.md
@@ -44,11 +44,11 @@ $ make docker-check
 - [?] TestFinitePosetMeasurement
 - [X] TestFinitePosetConstructionProduct
 - [?] TestFinitePosetConstructionSum
-- [?] TestFinitePosetConstructionOpposite
+- [X] TestFinitePosetConstructionOpposite
 - [?] TestFinitePosetConstructionTwisted
 - [?] TestFinitePosetConstructionArrow
 
-- [ ] TestFiniteMonotoneMapProperties
+- [X] TestFiniteMonotoneMapProperties
 
 ## Exercises for Nov. 20
 
diff --git a/src/act4e_solutions/posets_bounds.py b/src/act4e_solutions/posets_bounds.py
index c1c6310..05f818f 100644
--- a/src/act4e_solutions/posets_bounds.py
+++ b/src/act4e_solutions/posets_bounds.py
@@ -2,6 +2,8 @@ from typing import Any, List, Optional, overload, TypeVar
 from itertools import product
 from functools import cmp_to_key
 
+from .posets_representation import MyFinitePoset
+
 import act4e_interfaces as I
 
 E = TypeVar("E")
@@ -17,7 +19,13 @@ class SolFinitePosetMeasurement(I.FinitePosetMeasurement):
 
 class SolFinitePosetConstructionOpposite(I.FinitePosetConstructionOpposite):
     def opposite(self, p: I.FinitePoset[X]) -> I.FinitePoset[X]:
-        raise NotImplementedError() # implement here
+        e = p.carrier().elements()
+        values = []
+        for a, b in product(e, e):
+            if p.holds(a, b):
+                # then the opposite holds(b, a)
+                values.append((b, a))
+        return MyFinitePoset(p.carrier(), values)
 
 
 class SolFinitePosetSubsetProperties(I.FinitePosetSubsetProperties):
diff --git a/src/act4e_solutions/posets_map.py b/src/act4e_solutions/posets_map.py
index a91d4d8..8d28c62 100644
--- a/src/act4e_solutions/posets_map.py
+++ b/src/act4e_solutions/posets_map.py
@@ -1,5 +1,8 @@
 from typing import TypeVar
 
+from itertools import product
+from .posets_bounds import SolFinitePosetConstructionOpposite
+
 import act4e_interfaces as I
 
 A = TypeVar("A")
@@ -9,7 +12,13 @@ X = TypeVar("X")
 
 class SolFiniteMonotoneMapProperties(I.FiniteMonotoneMapProperties):
     def is_monotone(self, p1: I.FinitePoset[A], p2: I.FinitePoset[B], m: I.FiniteMap[A, B]) -> bool:
-        raise NotImplementedError()
+        A = p1.carrier().elements()
+        for x, y in product(A, A):
+            if p1.holds(x, y):
+                if not p2.holds(m(x), m(y)):
+                    return False
+        return True
 
     def is_antitone(self, p1: I.FinitePoset[A], p2: I.FinitePoset[B], m: I.FiniteMap[A, B]) -> bool:
-        raise NotImplementedError()
+        opp = SolFinitePosetConstructionOpposite()
+        return self.is_monotone(opp.opposite(p1), p2, m)