The basic idea now known as the Z-transform was known to Laplace, and re-introduced in 1947 by W. Hurewicz and others as a way to treat sampled-data control systems used with radar.
The basic idea now known as the Z-transform was known to Laplace and is the basis of the method now known as Laplace transform. It was re-introduced during the Second World War by W. Hurewicz and others as a way to treat sampled-data control systems used with radar.