Recent content by Prpan

Limiting the existence of something to the ability to reach it is not correct. If you could prove that we cannot have visitors from other time that would be a solution. According to the present state of theory one can invert time and no law of physics will be broken. Thus the feasibility of time...

Why should point have no definition? I guess it has a pretty good definition in integral calculus as a device for integration of 0-dimensional infinitesimally small quantities (points in algebraic and geometric sense) into multidimensional objects. 1-D integral will give a path, which is still...

I came across of an equality which I have difficulty to understand. If f_n is a rational algebraic homogeneous function of degree n in the differential operators and if g_n is a regular non-differential homogeneous function of the same degree n, following equality takes place [Hobson: The theory...