File:High Band Pass Motor-Transformer, v9me, schematic.png

This simulation demonstrates the A Priori of Negative Resistance lies within the Magnetic Field of Mutual Inductance.

This schematic of a Micro-Cap 12 simulation demonstrates the “A Priori” of [https://www.bing.com/search?q=negative+differential+resistance&FORM=SSQUIC&PC=U531&lightschemeovr=1 ''negative resistance''] lies within the inversion of magnetic polarity of its mutual inductances. Reversal of current is merely its diagnostic check and is the only visible measure of negative resistance owing to the invisible non-saturation of the magnetic fields of mutual inductances which are so thoroughly hidden from our view that we may merely infer (by way of logical deduction) the actuality of this ''a priori'' first cause of what generates the expansion of reactive potentialities into what we colloquially call: “free energy” and [[wikt:over-unity|overunity]] of output which is less sagacious then the more accurate comparison between output versus input as a ratio coefficience of performance less than unity.