Hello, pagid, you wrote: EP>> About and ballistics I will tell nothing, and here resistance of materials it as a matter of fact applied mathematics - on the basis of hypotheses and assumptions (a hypothesis of plane sections, a principle of Saint-Venant, etc.) is under construction a mathematical model and is researched by mathematical methods ( given functions, Slough, derivative lines beam axes, integrals on sections, tensors of pressure etc., etc.) Further mathematical methods estimate applicability of this model to real systems on the basis of experiments. P> then also to the physicist and . it is necessary to consider too . Why it "is necessary"? The applied mathematics in the pure state also is. Arithmetics applied daily for count of the prices it is conclusive consider as mathematics - than . is worse? Historically it is one of the first areas of application of mathematics, and it is reverse - one of areas from which mathematics grew. Certainly it is possible to argue/philosophize on that how much these application-oriented disciplines were isolated, and whether there is any edge of isolation crossing which discipline ceases to be mathematics is a question of terminology. But I anyway resolutely do not understand those who for some reason names mathematics, but does not award this honor . Or for example considers that in algorithms of the mathematician appears only when to them the asymptotic analysis of complexity is applied, but thus do not consider as mathematics the analysis of an absolute amount of operations and their cost, not to mention the internal device of algorithms. That is here or then all it to consider as mathematics, or anything (with what I do not agree, but it at least internally a consistent position).