From the archive · Tuesday, 25 August 2026

The daily pick

One work a day, drawn from the 1,767 works in the library with a copy you can open — the same one for everybody, and a different one tomorrow.

Paper1932

Regeneration Theory

Harry Nyquist

Shows that a feedback amplifier's stability can be read directly from how its open-loop response encircles a single point in the complex plane, without ever solving the closed-loop equations.

Level: Advanced
Access: Free
Length: —
Copy: link checked 17 Sept 2026
Filed under: Control Systems Engineering

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