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the inherently economical number of components required. Tge ternary logic Ternary computer logic offers the advantage over other t pes of logic in element which we shall consider is defined as follows. A 2*input, ternary, combinatorial, switching device is a device having two input channels and one output channel. Each channel can have only one of three distinct, s ecified signals on it at a given time. The particular signal which appears on tEe out, put channel is completely determined by the si nals on the input channels at that time. The form of the logic element whict we shall consider here turns out to be, with its sister element obtained by a reversal of sign, to form a functionally complete set of ternary logic elements. One of the requirements of any logic element is that it exhibits the closure property, that is, the output takes only the values of the inputs. This requires a non-linear phenomena. The saturable Hall effect exhibits such a nonelinear phenomena and we have applied it as a ternary logic element. effect will saturate according to the relation For conductors or superconductors with very high mobility the Hall Iy/Ix ~p B l ( 1 + /LIB*) where I. is the primary constant current and Iy is the Hall current when the ydirection of the sample has been shorted. The magnetic field is denoted by B and the mobility by p. The ternary logic element is constructed by apply. ing B with two separate coils, these coils constituting the two inputs to the device. The output is the Hall current, 17:, By choosing the proper operating points, Le., one can get the following truth table". output c 0 0 + 1 + 1For low operating fields and high speeds one needs a very high mobility.

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