Mathematics is a science made by human beings, and therefore every time, just as every people has its own spirit.
Georg Cantor (1845-1918)
In particular, introducing new numbers, math has the sole obligation to give the definitions of them, by means of which will be given a definable and, if circumstances permit, such […]
Bertrand Russell (1872-1970)
Mathematics may be defined as the science in which we never know what we are talking about, nor whether what we say is true.