  Many types of detectors, such as cathode strip chambers and some MPGDs, allow
us to reconstruct track positions by induced strip charges. There are two main
types of algebraic methods for this reconstruction: center of gravity methods
and little-known differential methods. General formulas for differential
methods are derived. Their performance is compared with the performance of
center of gravity methods. It is shown that the differential methods are better
than the previously known center of gravity methods, but the improved center of
gravity methods provide results similar to the results of differential methods.
