The term "Renaissance classicism" refers to a fundamental attribute of the period that scholars refer to as the European Renaissance, roughly 1400–1600. Renaissance classicism was an intellectual movement that sought to mimic the literature, rhetoric, art, and philosophy of the ancient world, specifically ancient Rome. Scholars, politicians, and philosophers looked to ancient literary and artis...

This is a short and simple introduction into perturbiners, that is, the solutions of field equations which are generating functions for tree amplitudes. The perturbiners have been constructed in Yang-Mills, in SUSY Yang-Mills, in gravity, and in sin(h)-Gordon.