diff --git a/hipparchus-core/src/main/java/org/hipparchus/analysis/polynomials/PolynomialFunction.java b/hipparchus-core/src/main/java/org/hipparchus/analysis/polynomials/PolynomialFunction.java
index d092a4bc0..36e56a817 100644
--- a/hipparchus-core/src/main/java/org/hipparchus/analysis/polynomials/PolynomialFunction.java
+++ b/hipparchus-core/src/main/java/org/hipparchus/analysis/polynomials/PolynomialFunction.java
@@ -392,7 +392,7 @@ public String toString() {
                 s.append('x');
                 if (i > 1) {
                     s.append('^');
-                    s.append(Integer.toString(i));
+                    s.append(i);
                 }
             }
         }
@@ -434,10 +434,7 @@ public boolean equals(Object obj) {
             return false;
         }
         PolynomialFunction other = (PolynomialFunction) obj;
-        if (!Arrays.equals(coefficients, other.coefficients)) {
-            return false;
-        }
-        return true;
+        return Arrays.equals(coefficients, other.coefficients);
     }
 
     /**