Modifiers matching equation:

• physical,
• transcendental,
• complex,
• complicated,
• model,
• mathematical,
• simple,
• nonlinear,
• operational,
• kinetic,
• functional,
• related,
• typical,
• logical,
• explicit,
• linear,
• basic,

Simple categories matching nonlinear:

• system,
• amplifier,
• conductor,
• structure,
• circuitry,
• medium,
• relationship,
• propagation,
• plant,
• component,
• regression,
• dielectric,
• solution,
• device,
• material,
• distortion,
• concept,
• phenomenon,
• behavior,
• transformation,
• variation,
• method,
• problem,
• crystal,
• function,
• operator,
• polymer,
• model,
• event,
• science,
• circuit,
• process,
• equation,
• wave,
• scale,
• fluid,
• converter,
• quality,
• mass,
• property,