 (The point just made does not impugn analog computation in the standard sense of Pour-El (1974). Analog computation does not manipulate exact values of arbitrary real-valued quantities but rather continuous variables. Although the continuous variables used in most analog computations may be assumed to take any real value within a relevant interval, concrete analog computation requires only the manipulation and measurement of real variables within some degree of approximation. So, analog computation does not falsify Bold Physical CTT (cf. Rubel 1989).)