During the Renaissance, Gemistos Plethon brought Plato's original writings to Florence from Constantinople in the century of its fall. Many of the greatest early modern scientists and artists who broke with Scholasticism, with the support of the Plato-inspired Lorenzo (grandson of Cosimo), saw Plato's philosophy as the basis for progress in the arts and sciences. The 17th century Cambridge Platonists sought to reconcile Plato's more problematic beliefs, such as metempsychosis and polyamory, with Christianity.[81] By the 19th century, Plato's reputation was restored, and at least on par with Aristotle's. Plato's influence has been especially strong in mathematics and the sciences. Plato's resurgence further inspired some of the greatest advances in logic since Aristotle, primarily through Gottlob Frege. Albert Einstein suggested that the scientist who takes philosophy seriously would have to avoid systematization and take on many different roles, and possibly appear as a Platonist or Pythagorean, in that such a one would have "the viewpoint of logical simplicity as an indispensable and effective tool of his research."[82] British philosopher Alfred North Whitehead said: "the safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato."[4][83] Adapting examples from Plato's Theaetetus, Edmund Gettier famously demonstrated the Gettier problem for the "justified true belief account" of knowledge, challenging the prevalent notion in Analytic philosophy at the time that had been popularized by A. J. Ayer.[84]