Response to “ Pinched Hysteresis Loops is the Fingerprint of Memristive Devices ”

This is a short response to a recent paper by Kim et al. [1] which correctly notes that the zerocrossing pinched hysteresis loop of a memristor or memristive system must hold for all amplitudes, for all frequencies, and for all initial conditions, of any periodic testing waveform, such as sinusoidal or triangular signals, which assumes both positive and negative values over each period of the waveform. An example is noted from the literature indicating that TiO2 memory resistors might not be considered either memristors or memristive systems given this constraint. Keywordsnon-linear dynamic systems, memresistor,