Leonhard Euler
# Leonhard Euler

Leonhard Euler (Basiléia, 15 de abril de 1707 - São Petersburgo, 18 de setembro de 1783) foi um matemático e físico suíço.
       - But you have only to look at this thousandth part of an inch through a good microscope, which magnifies, for example, a thousand times, and each particle will appear as large as an inch to the naked eye ; and you will be convinced of the possibility of dividing each of these particles again into a thousand parts : the same reasoning may always be carried forward without limit and without end.‎
          - "Letters of Euler on different subjects in natural philosophy: addressed to a German princess" - Volume 2, página 36, de Leonhard Euler, Sir David Brewster, John Griscom, Editora J. & J. Harper, 1833
       - How often are our reasonings erroneous ! I venture to affirm, that we are much more frequently deceived by these than by our senses. But does it follow that our reasonings are always fallacious, and that we can have no dependence on any truth discovered to us by the understanding
          - "Letters of Euler on different subjects in natural philosophy: Addressed to a German princess. With notes, and a life of Euler", Volume 2 - página 17, de Leonhard Euler, Editora J. & J. Harper, 1833
       - But in attempting to dive into the mysteries of nature, it is of importance to know if the heavenly bodies act upon each other by impulsion, or by attraction; if a certain subtile invisible matter impels them towards each other ; or if they are endowed with a secret or occult quality, by which they are mutually attracted.‎
          - "Letters of Euler to a German princess, on different subjects in physics and philosophy", Volume 1 - página 211, de Leonhard Euler, Henry Hunter, Jean-Antoine-Nicolas de Caritat Condorcet, Traduzido por Henry Hunter, Edição 2, Editora Murray and Highley, 1802