Feat(Core): Add compute add for 2 mostr and 2 mostrpower

mapytex/calculus/core/typing/add.py

@@ -156,6 +156,19 @@ def mopolynomial_moscalar(left, right):
     new_coefs = {**new_coefs, **left.coefficients}
     return MOpolynomial(left.variable, new_coefs)
 
+@add.register(MOstr, MOstr)
+def mostr_mostr(left, right):
+    """ add 2 mostr
+
+    >>> a = MOstr('x')
+    >>> b = MOstr('x')
+    >>> add(a, b)
+    <MOMonomial 2x>
+    """
+    if left != right:
+        raise NotImplementedError("Can't add 2 Mostr without same letter")
+    return MOMonomial(2, left) 
+
 @add.register(MOstr, MOstrPower)
 def mostr_mostrpower(left, right):
     """ add a scalar with a letter to create a MOpolynomial
@@ -188,6 +201,22 @@ def mostrpower_mostr(left, right):
         raise 
     return MOpolynomial(right , {1: 1, left.power: 1})
 
+@add.register(MOstrPower, MOstrPower)
+def mostrpower_mostrpower(left, right):
+    """ add 2 mostrpower
+
+    >>> a = MOstrPower('x', 3)
+    >>> b = MOstrPower('x', 3)
+    >>> add(a, b)
+    <MOMonomial 2x^3>
+    """
+    if left.variable != right.variable:
+        raise NotImplementedError("Can't add 2 Mostrpower without same letter")
+    if left.power != right.power:
+        raise NotImplementedError("Can't add 2 Mostrpower with compute if not same degree")
+
+    return MOMonomial(2, left.variable, left.power) 
+
 @add.register(MOstr, MOpolynomial)
 def mostr_mopolynomial(left, right):
     """ add a str with a MOpolynomial to create a MOpolynomial