diff --git a/src/fr/iut/uca/Operations.java b/src/fr/iut/uca/Operations.java
index 9246c19..164fe6f 100644
--- a/src/fr/iut/uca/Operations.java
+++ b/src/fr/iut/uca/Operations.java
@@ -1,7 +1,7 @@
 package fr.iut.uca;
 
 public class Operations {
-	public long Add(long a, long b, long... others) {
+	public long add(long a, long b, long... others) {
 
 		long res = a + b;
 		
@@ -14,7 +14,7 @@ public class Operations {
 		return res;
 	}
 	
-	public long Multiply(long a, long b, long... others) {
+	public long multiply(long a, long b, long... others) {
 
 		long res = a * b;
 
@@ -27,7 +27,7 @@ public class Operations {
 		return res;
 	}
 
-	public long Divide(long a, long b, long... others) {
+	public long divide(long a, long b, long... others) {
 		if(b == 0) {
 			throw new ArithmeticException("attempted to divide by zero");
 		}
@@ -46,4 +46,16 @@ public class Operations {
 		return res;
 	}
 	
+	public boolean pythagoras(long a, long b, long c) {
+		if(a <= 0 || b <= 0 || c <= 0) {
+			throw new ArithmeticException("there is no such thing as a negative length for a triangle's side");
+		}
+		
+		return (
+				(a * a) + (b * b) == c * c
+				|| (c * c) + (b * b) == a * a
+				|| (a * a) + (c * c) == b * b
+				);
+	}
+	
 }
diff --git a/src/fr/iut/uca/PleaseEclipseCmon.java b/src/fr/iut/uca/PleaseEclipseCmon.java
index f0c315b..c699a20 100644
--- a/src/fr/iut/uca/PleaseEclipseCmon.java
+++ b/src/fr/iut/uca/PleaseEclipseCmon.java
@@ -5,7 +5,6 @@ public class PleaseEclipseCmon {
 	public static void main(String[] args) {
 	
 		Operations operation = new Operations();
-		System.out.println(operation.Add(2, 2, 2, 2, 3));
-		System.out.println(0 == -0);
+		System.out.println(operation.add(2, 2, 2, 2, 3));
 	}
 }
diff --git a/src/test/OperationsTests.java b/src/test/OperationsTests.java
index fd435f3..46b27d7 100644
--- a/src/test/OperationsTests.java
+++ b/src/test/OperationsTests.java
@@ -28,7 +28,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -45,7 +45,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -62,7 +62,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -79,7 +79,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -96,7 +96,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -113,7 +113,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -130,7 +130,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -147,7 +147,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, null);
+		long actual = op.add(x, y, null);
 		
 		// Assert
 
@@ -167,7 +167,7 @@ class OperationsTests {
 		
 		// Act
 		
-		long actual = op.Add(x, y, z1, z2, z3);
+		long actual = op.add(x, y, z1, z2, z3);
 		
 		// Assert
 
@@ -176,10 +176,11 @@ class OperationsTests {
 	
 	@Test
 	void rdm() {
+		Random rdm = new Random();
+		
 		for(int i = 0 ; i <10; i++) {
 			// Arrange
 		
-			Random rdm = new Random();
 			long rdmX =rdm.nextLong();
 			long rdmY = rdm.nextLong();
 		
@@ -197,7 +198,7 @@ class OperationsTests {
 		
 			// Act
 		
-			long actual = op.Add(rdmX, rdmY, null);
+			long actual = op.add(rdmX, rdmY, null);
 		
 			// Assert