On the Lisbon earthquake of 1755; its effects on thinking of the time.

In the historiography of mathematics the concept of deviation is relative to a normal way of developing mathematics. Similarly, the concept of abbreviation is necessarily connected to some aim to which this development is directed. We should not speak of deviation or abbreviation without regard for such contects. In the history of mathematics there are some cases of treating impossible objects as possible objects of a new theory. Therefore it may be expected that there are more ways out than in (...) normal life. Some examples are given. *** DIRECT SUPPORT *** A02GD002 00011. (shrink)