  In Metaphysics vi.1, Aristotle argues that physics concerns things which have change, but are substances, that at least some of the things that mathematics is about do not change and are eternal but are not substances (exceptions would probably include stars and spheres in mathematical astronomy and bodies in mathematical kinematics), while first philosophy or theology is about things which are substances but do not change and are eternal. We can now characterize the way in which mathematical objects are eternal and lack change. Namely, generation and change are not among the predicates studied by geometry or arithmetic. Hence, it is correct to say that qua lines, perceptible lines lack generation, destruction, and change (with appropriate provisos for kinematics and mathematical astronomy).