¿Le gritas al niño?

Los gritos perjudican en la educación de los hijos.

Los gritos perjudican en la educación de los hijos.     Los problemas asociados con castigos físicos son ya conocidos. Pero los padres que nunca pensaron en darle a sus hijos terminan gritándoles cuando los pequeños los llevan al borde. Mostrar detalle

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Gramática

¡Salvemos al lenguaje! Por Margarita Bellorín C.

¡Salvemos al lenguaje! Por Margarita Bellorín C.     

El género

En castellano existen los participios activos como derivado de los tiempos verbales. El participio activo del verbo atacar es "atacante"; el de salir es "saliente"; el de cantar es "cantante" y el de existir, "existente". ¿Cuál es el del verbo ser? Es "-ente", que significa "el que tiene identidad", en definitiva "el que es". Por ello, cuando queremos nombrar a la persona que denota capacidad de ejercer la acción que expresa el verbo, se añade a este la terminación "-ente". Así, al que preside, se le llama "presidente" y nunca "presidenta", independientemente del género (masculino o femenino) del que realiza la acción. De manera análoga, se dice "capilla ardiente", no "ardienta"; se dice "estudiante", no "estudianta"; se dice "independiente" y no "independienta"; "paciente", no pacienta"; "dirigente", no dirigenta"; "residente", no "residenta. Otra cosa son las palabras que, terminadas en "a", son aplicables a ambos sexos. Los hombres que ejercen el periodismo no son "periodistos", son periodistas. Tampoco existen el dentisto, el poeto, el sindicalisto, el pediatro, el pianisto, el golfisto, el arreglisto, el funambulisto, el proyectisto, el turisto, el contratisto, el paisajisto, el taxisto, el artisto, el taxidermisto, el telefonisto, el masajisto, el trompetisto, el violinisto, el maquinisto, el electricisto, el oculisto, el policío ni, por supuesto, el machisto. Puede haber una "mujer soldado", que no es igual a una "mujer soldada". Los que, en aras de ser políticamente correctos usan lenguaje incluyente (no "incluyenta"), hacen mal uso del idioma por dos razones: motivos ideológicos e ignorancia de la Gramática de la Lengua Española. Su profunda ignorancia les lleva a aplicar patrones ideológicos y la misma aplicación automática de esos patrones los hace más ignorantes. Por favor, COMPARTE. ¡Salvemos al lenguaje! Por Margarita Bellorín C. Mostrar detalle

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Mathematics

Know the Association for Women in Mathematics

Know the Association for Women in Mathematics     We aim to encourage and support women in the specific discipline of mathematics. In particular, we would like to bring together women undergraduates, graduates and members of faculty in the mathematics department, to provide mutual support and to increase the visibility of women in mathematics. Some planned activities of our organization include having speakers, either from the U of C community or elsewhere, to discuss issues relating to women in math, running a mentoring program for women in math, and providing online resources for women in math. Mostrar detalle

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Logic

While at Cambridge he taught a course on the foundations of mathematics.

While at Cambridge he taught a course on the foundations of mathematics.     

Maxwell Herman Alexander Newman

Newman also wrote an important paper on theoretical computer science, produced a topological counter-example of major significance in collaboration with Henry Whitehead, and wrote an outstanding paper on periodic transformations in abelian topological groups. He only wrote one book Elements of the topology of plane sets of points (1939). Writing in [4], Peter Hilton claims that:- ... this is the only text in general topology which can be wholeheartedly recommended without qualification. It is beautifully written in the limpid style one would expect of one who combined clarity of thought, breadth of view, depth of understanding and mastery of language. Newman saw, and presented, topology as part of the whole of mathematics, not as an isolated discipline: and many must wish he had written more. In 1962 Newman was presented with the De Morgan Medal from the London Mathematical Society. The President of the Society, Mary Cartwright, gave a tribute to Newman's work which is reported in [3]:- His early work on Combinatory Topology has exercised a decisive influence on the development of that subject. At a time when the study of manifolds was based on a number of different combinatory concepts, he established a simple combinatory system of simplicial complexes with an equivalence relation based on elementary moves. ... He has proved two important results about fixed points. The first was an early inroad on Hilbert's Fifth Problem, in which he proved that abelian continuous groups do not have arbitrarily small subgroups, the second was a simplified proof of a difficult fixed point theorem of Cartwright and Littlewood arising in the study of differential equations. ... In 1964 Newman retired from his Manchester chair but he most certainly did not give up mathematics. He taught a course at the University of Warwick and at this time I [EFR] was a research student there and met him and attended lectures he gave. He was an outstanding teacher, clearly giving much attention to the organisation of his material. Retirement was also an opportunity for Newman to relaunch his research career which he did with the vigour of a young academic. He published a highly significant paper in 1966 which proved the Poincaré Conjecture for topological manifolds of dimension greater than 4. Lynn Newman died in 1973, and later in the same year he married Margaret Penrose, the daughter of a professor of physiology, who was the widow of the physician Professor Lionel Sharples Penrose. Mostrar detalle

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Autism

Brain connections in people with autism show more symmetry between hemispheres. @SDSU

Brain connections in people with autism show more symmetry between hemispheres. @SDSU     Divvying up tasks between the left and right hemispheres of the brain is one of the hallmarks of typical brain development. The left hemisphere, for instance, is involved in analyzing specific details of a situation, while the right hemisphere is more important for integrating all the various streams of information coming into the brain. A new study by neuropsychologists at San Diego State University suggests that in children and adolescents with autism spectrum disorder (ASD), the brains’ hemispheres are less likely to specialize one way or another. The finding gives further insight into how brain development in people with ASD contributes to the disorder’s cognitive characteristics. Mostrar detalle

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Habits

Highly Effective Students Don't attempt to cram all your studying into one session.

Highly Effective Students Don't attempt to cram all your studying into one session.      Mostrar detalle

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Correlation

The Development of Correlation and Association in Statistics

The Development of Correlation and Association in Statistics     The Development of Correlation and Association in Statistics Jake D. Brutlag fifth revision 12/15/07 The object of statistical science is to discover methods of condensing information concerning large groups of allied facts into brief and compendious expressions suitable for discussion --Sir Francis Galton (1822-1911) One historical motivation for the field of statistics was to capture the meaning of data in "brief and compendious expressions." It is one thing to glance at a table of numbers and claim "I see some meaning here"; it is quite another to demonstrate such a table constitutes evidence for a particular conclusion. In the study of two random variables measured in the same sample, correlation measures the degree to which the two measures are linearly related. A related concept is the regression model, in which the goal is to find a linear equation that best predicts the value of one variable (or measurement), given the value of the other variable. The best estimate of the slope in the regression model, y = b(x) + a, is related to the correlation coefficient, r, by: Mostrar detalle

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Spanish-Aphabet

Actual official spanish language alphabet

Actual official spanish language alphabet     

Proposal for a single name for each of the letters of the alphabet

Some of the letters have several names with tradition and validity in different Hispanic areas of the field. The new edition of spelling, non-profit interfere with the freedom of each speaker or country to continue using the name to that is habituated, it aims to promote forward a process of convergence in the way of referring to the letters of the alphabet, why recommended, for each, a unique common name. He recommended common name is listed in the following ratio below each letter. Mostrar detalle

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Mathematical-habits

Habits of highly mathematical people

Habits of highly mathematical people     The most common question students have about mathematics is “when will I ever use this?” Many math teachers would probably struggle to give a coherent answer, beyond being very good at following precise directions. They will say “critical thinking” but not much else concrete. Meanwhile, the same teachers must, with a straight face, tell their students that the derivative of arccosine is important. (It goes beyond calculus, in case you were wondering) So here is my list. The concrete, unambiguous skills that students of mathematics, when properly taught, will practice and that will come in handy in their lives outside of mathematics. Some of these are technical, the techniques that mathematicians use every day to reason about complex, multi-faceted problems. Others are social, the kinds of emotional intelligence one needs to succeed in a field where you spend almost all of your time understanding nothing. All of them are studied in their purest form in mathematics. The ones I came up with are,
Discussing definitions
Coming up with counterexamples
Being wrong often and admitting it
Evaluating many possible consequences of a claim
Teasing apart the assumptions underlying an argument
Scaling the ladder of abstraction
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Education

Polynomials evaluated at integers by John D. Cook

Polynomials evaluated at integers by  John D.  Cook     Let p(x) = a0 + a1x + a2x2 + … + anxn and suppose at least one of the coefficients ai is irrational for some i ≥ 1. Then a theorem by Weyl says that the fractional parts of p(n) are equidistributed as n varies over the integers. That is, the proportion of values that land in some interval is equal to the length of that interval. Clearly it’s necessary that one of the coefficients be irrational. What may be surprising is that it is sufficient. If the coefficients are all rational with common denominator N, then the sequence would only contain multiples of 1/N. The interval [1/3N, 2/3N], for example, would never get a sample. If a0 were irrational but the rest of the coefficients were rational, we’d have the same situation, simply shifted by a0. This is a theorem about what happens in the limit, but we can look at what happens for some large but finite set of terms. And we can use a χ2 test to see how evenly our sequence is compared to what one would expect from a random sequence. Mostrar detalle

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