"In experience never meets two absolutely similar complexes. Distinctions can be практически-ничтожны - "безконечно-малы", but at sufficient изследовании them always would be found out. It is impossible to find two fully similar leaves on all plants of the world, it is impossible even, as it is clear shown by a molecular-kinetic theory, to find two fully similar drops of water in all oceans of the world. It behaves not only to the "real" to the complexes, but also to "ideal", only conceivable. Geometers can "think" absolutely-similar lines, т.-е. verbally to designate them, as such, but these lines exist in fact only in the acts of thinking, and two acts of thinking, even the same person in different moments, can not be absolutely identical".