Defined by Einstain (1879-1955):

  1. Pure mathematics is, in its way, the poetry of logical ideas.
  2. God does not care about our mathematical difficulties. He integrates empirically.
  3. As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.
  4. Do not worry about your difficulties in mathematics. I can assure you mine are still greater.
  5. We cannot solve our problems with the same thinking we used when we created them.