Writing had always been one of my strengths, but it was challenging to take that initial step past the high school, five-paragraph essay form that constricted my ideas for so long. Moving past this form, however, has greatly opened my mind. My thoughts are now able to be more complex because I have learned how to sustain a logical argument in an organized manner. My writing has become increasingly more concise and I no longer have room for added "fluff" or "padding." Another improvement is my ability to point out multiple complexities within a text, instead of sticking to one-sided arguments in my papers. Furthermore, learning how to find peer reviewed journal articles and order books through interlibrary loan has significantly widened the scope of my research, which has lead to more scholarly papers with credible references. My writing is so much more interesting than it used to be.
The term "reflection" is sometimes used for a larger class of mappings from a Euclidean space to itself, namely the non-identity isometries that are involutions. Such isometries have a set of fixed points (the "mirror") that is an affine subspace , but is possibly smaller than a hyperplane. For instance a reflection through a point is an involutive isometry with just one fixed point; the image of the letter p under it would look like a d . This operation is also known as a central inversion ( Coxeter 1969 , §), and exhibits Euclidean space as a symmetric space . In a Euclidean vector space , the reflection in the point situated at the origin is the same as vector negation. Other examples include reflections in a line in three-dimensional space. Typically, however, unqualified use of the term "reflection" means reflection in a hyperplane .
Si la isla de Cuba tiene la forma de un caimán dormido, como se dice, sería en su ojo donde encontraríamos la ciudad de La Habana. Con sus más de dos millones de habitantes, casi el 20% de la población cubana, La Habana es una ciudad multicolor que nos permite disfrutar de la arquitectura desde el estilo colonial del XVI hasta el más actual, pasando por el Barroco, el Neoclásico, el Art-déco o el Modernismo más ecléctico. En 1982, la Unesco declaró el casco histórico de La Habana como Patrimonio de la Humanidad. Conócela mejor con don Quijote.