But 'the physical level of rigor' is higher on certainty than the logical one, since reproducible experiments are more reliable than anybody's, be it Hilbert's, Einstein's or Gรถdel's intuition.
Mikhail Leonidovich GromovBut anything that can be called "rigor" is lost exactly where the things become interesting and non trivial.
Mikhail Leonidovich GromovThis common and unfortunate fact of the lack of adequate presentation of basic ideas and motivations of almost any mathematical theory is probably due to the binary nature of mathematical perception. Either you have no inkling of an idea, or, once you have understood it, the very idea appears so embarrassingly obvious that you feel reluctant to say it aloud.
Mikhail Leonidovich GromovA mathematician would hardly call a correspondence between the set of 64 triples of four units and a set of twenty other units, "universal", while such correspondence is, probably, the most fundamental general feature of life on Earth.
Mikhail Leonidovich Gromov