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A paraconsistent logic is a logical system that attempts to deal with contradictions in a discriminating way. Alternatively, paraconsistent logic is the subfield of logic that is concerned with studying and developing paraconsistent (or "inconsistency-tolerant") systems of logic.
Inconsistency-tolerant logics have been discussed since at least 1910 (and arguably much earlier, for example in the writings of Aristotle); however, the term paraconsistent ("beside the consistent") was not coined until 1976, by the Peruvian philosopher Francisco Miró Quesada.
== Definition ==
In classical logic (as well...
When I read the mathematical analysis ,I think if the differential is $dy=Adx^2$ $A$ is a function about x, what will happen? Maybe, it is not proper defined ,but I think the "function" meet $dy=A(dx)^2$ will has some fractal structure.
Evening in its primary meaning is the period of the day between afternoon and night. Though the term is subjective, evening is typically understood to begin when the temperature has noticeably fallen and other accompanying weather changes have occured, such as increased wind speed and change in cloud types and sky color, and lasts until an hour or so after sunset, when maximum darkness has been reached.
The evening is also characterized by the activities which usually occur during this time, such as preparing and eating dinner or having more-formal social gatherings and entertainment with friends...
In vector calculus, the curl is a vector operator that describes the infinitesimal rotation of a 3-dimensional vector field. At every point in the field, the curl of that field is represented by a vector. The attributes of this vector (length and direction) characterize the rotation at that point.
The direction of the curl is the axis of rotation, as determined by the right-hand rule, and the magnitude of the curl is the magnitude of rotation. If the vector field represents the flow velocity of a moving fluid, then the curl is the circulation density of the fluid. A vector field whose curl is zero...
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Can we avoid the use of the geometric interpretation combined with polar coordinates change of variable for proving that
$$\int_0^{\pi/2} \int_0^{\pi/2} \frac{\cos(\psi)}{ \cos(a \cos(\psi) \cos(\varphi))} d\psi d\varphi =\frac{\pi}{ 2a}\log\left( \frac{\displaystyle 1+ \tan \left(\frac{a}{2}\...02:00 - 16:0016:00 - 00:00
