(self)
return None
Decrease the level of self.

        This makes the working differential extension smaller.  self.level is
        given relative to the end of the list (-1, -2, etc.), so we don't need
        do worry about it when building the extension.
Decrease the level of self.
Decrease the level of self .
def decrement_level(self):
        """
        Decrease the level of self.

        This makes the working differential extension smaller.  self.level is
        given relative to the end of the list (-1, -2, etc.), so we don't need
        do worry about it when building the extension.
        """
        if self.level <= -len(self.T):
            raise ValueError("The level of the differential extension cannot "
                "be decremented any further.")

        self.level -= 1
        self.t = self.T[self.level]
        self.d = self.D[self.level]
        self.case = self.cases[self.level]
        return None
def decrement_level ( self ) : if self . level <= - len ( self . T ) : raise ValueError ( "The level of the differential extension cannot " "be decremented any further." ) self . level -= 1 self . t = self . T [ self . level ] self . d = self . D [ self . level ] self . case = self . cases [ self . level ] return None