I’ve got to get used to the new Weekly Photo Challenge starting on Wednesday. I caught it the first week, but not this. At any rate here are two rare birds that make a good match, I think. 214 more words
Tags » XI
Is Trump’s Ego Picking a Fight with China?
Are Xi’s China and Trump’s America on a collision course toward war?
It may certainly feel that way sometime. China under Xi Jinping has become more intransigent and more assertive – aggressive even – when it comes to promoting its selfperceived national interests. 893 more words
Set Theory

Introduction
The set theory, developed by George Cantor, forms a basis for advanced mathematical topics, such as the calculus, real and complex analysis etc. It defines functions, which are an extremely important entity in mathematics. 749 more words
Sequences and Series
We use the words sequence and series interchangeably and we generally mean a continuation of numbers/events by them. In mathematics, however, these words have a particular meaning. 563 more words
Hyperbola
NOTE: We are going to use the section formula to derive the equation of hyperbola, as we did for ellipse. Since there are 2 variants of the formula (external and internal division), we get 2 foci and 2 directrices. 156 more words
Ellipse
NOTE: We are going to use the section formula to derive the equation of ellipse. Since there are 2 variants of the formula (external and internal division), we get 2 foci and 2 directrices. 130 more words
Parabola
The word parabola originated as a combination of 2 Greek words, para, which means besides and bole, which means throw. When any heavy object is thrown in air, its trajectory is a parabola. 134 more words