diff --git a/Maths/AbsoluteMax.java b/Maths/AbsoluteMax.java
index f454f8ae0..05aa653bd 100644
--- a/Maths/AbsoluteMax.java
+++ b/Maths/AbsoluteMax.java
@@ -10,7 +10,10 @@ import java.util.Arrays;
  */
 public class AbsoluteMax {
     public static void main(String[] args) {
-        int[] numbers = new int[]{3, -10, -2};
+    	int[] testnums = {-2, 0, 16};
+    	assert absMax(testnums) == 16;
+    	
+        int[] numbers = {3, -10, -2};
         System.out.println("absMax(" + Arrays.toString(numbers) + ") = " + absMax(numbers));
     }
 
diff --git a/Maths/AbsoluteMin.java b/Maths/AbsoluteMin.java
index 576019581..597944dca 100644
--- a/Maths/AbsoluteMin.java
+++ b/Maths/AbsoluteMin.java
@@ -10,7 +10,10 @@ import java.util.Arrays;
  */
 public class AbsoluteMin {
     public static void main(String[] args) {
-        int[] numbers = new int[]{3, -10, -2};
+    	int[] testnums = {4, 0, 16};
+    	assert absMin(testnums) == 0;
+    	
+        int[] numbers = {3, -10, -2};
         System.out.println("absMin(" + Arrays.toString(numbers) + ") = " + absMin(numbers));
     }
 
diff --git a/Maths/AbsoluteValue.java b/Maths/AbsoluteValue.java
index dc17213d6..da570d0b4 100644
--- a/Maths/AbsoluteValue.java
+++ b/Maths/AbsoluteValue.java
@@ -1,12 +1,12 @@
 package Maths;
 
-/**
- * @author PatOnTheBack
- */
-
 public class AbsoluteValue {
 
     public static void main(String[] args) {
+    	assert absVal(-13) == 13;
+    	assert absVal(0) == 0;
+    	assert absVal(100) == 100;
+    	
         int value = -34;
         System.out.println("The absolute value of " + value + " is " + absVal(value));
     }
diff --git a/Maths/MaxValue.java b/Maths/MaxValue.java
index b1b258685..9be31cd15 100644
--- a/Maths/MaxValue.java
+++ b/Maths/MaxValue.java
@@ -17,6 +17,11 @@ public class MaxValue {
     }
 
     public static void main(String[] args) {
+    	assert max(-3,3) == 3;
+    	assert max(-6,-20) == -6;
+    	assert max(100,32) == 100;
+    	assert max(13,13) == 13;
+    	
         int a = 3;
         int b = 4;
         System.out.format("max:%d between %d and %d", max(a, b), a, b);
diff --git a/Maths/MinValue.java b/Maths/MinValue.java
index ef1d6a085..7bafd880c 100644
--- a/Maths/MinValue.java
+++ b/Maths/MinValue.java
@@ -17,6 +17,11 @@ public class MinValue {
     }
 
     public static void main(String[] args) {
+    	assert min(-3,3) == -3;
+    	assert min(-6,-20) == -20;
+    	assert min(100,32) == 32;
+    	assert min(13,13) == 13;
+    	
         int a = 3;
         int b = 4;
         System.out.format("min:%d between %d and %d", min(a, b), a, b);
diff --git a/Maths/PythagoreanTriple.java b/Maths/PythagoreanTriple.java
new file mode 100644
index 000000000..4eae9615f
--- /dev/null
+++ b/Maths/PythagoreanTriple.java
@@ -0,0 +1,32 @@
+package Maths;
+
+/**
+ * https://en.wikipedia.org/wiki/Pythagorean_triple
+ *
+ */
+public class PythagoreanTriple {
+	public static void main(String[] args) {
+		assert isPythagTriple(3,4,5);
+		assert isPythagTriple(5,12,13);
+		assert isPythagTriple(6,8,10);
+		assert !isPythagTriple(10,20,30);
+		assert !isPythagTriple(6,8,100);
+		assert !isPythagTriple(-1,-1,1);
+	}
+	
+	/**
+	 * Check if a,b,c are a Pythagorean Triple
+	 * 
+	 * @param a x/y component length of a right triangle
+	 * @param b y/x component length of a right triangle
+	 * @param c hypotenuse length of a right triangle
+	 * @return boolean <tt>true</tt> if a, b, c satisfy the Pythagorean theorem, otherwise <tt>false</tt>
+	 */
+	public static boolean isPythagTriple(int a, int b, int c) {
+		if(a <= 0 || b <= 0 || c <= 0) {
+			return false;
+		} else {
+			return (a * a) + (b * b) == (c * c);
+		}
+	}
+}