(self)
return self[0, 0]
The A parameter of the Matrix.

        Examples
        ========

        >>> from sympy.physics.gaussopt import RayTransferMatrix
        >>> mat = RayTransferMatrix(1, 2, 3, 4)
        >>> mat.A
        1
The A parameter of the Matrix.
The A parameter of the Matrix .
def A(self):
        """
        The A parameter of the Matrix.

        Examples
        ========

        >>> from sympy.physics.gaussopt import RayTransferMatrix
        >>> mat = RayTransferMatrix(1, 2, 3, 4)
        >>> mat.A
        1
        """
        return self[0, 0]
def A ( self ) : return self [ 0 , 0 ]