fix: Renamed differential function to derivitive

src/polysolve/__init__.py

@@ -126,6 +126,26 @@ class Function:
         """
         Calculates the derivative of the function.
 
+        Returns:
+            Function: A new Function object representing the derivative.
+        """
+        warnings.warn(
+            "The 'differential' function has been renamed. Please use 'derivitive' instead.",
+            DeprecationWarning,
+            stacklevel=2
+        )
+
+        self._check_initialized()
+        if self._largest_exponent == 0:
+            raise ValueError("Cannot differentiate a constant (Function of degree 0).")
+
+        return self.derivitive()
+        
+    
+    def derivitive(self) -> 'Function':
+        """
+        Calculates the derivative of the function.
+
         Returns:
             Function: A new Function object representing the derivative.
         """
@@ -139,6 +159,7 @@ class Function:
         diff_func.set_coeffs(derivative_coefficients.tolist())
         return diff_func
     
+
     def get_real_roots(self, options: GA_Options = GA_Options(), use_cuda: bool = False) -> np.ndarray:
         """
         Uses a genetic algorithm to find the approximate real roots of the function (where y=0).