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Main Page - Encyclopedia of Mathematics

Main Page - Encyclopedia of Mathematics
Related:  Mathématique

Inclassables Mathématiques 2.0 Urban Dictionary, April 16: taxable Corso di Borsa e Trading On Line | Modellistica dei Mercati Con la nascita della borsa si sono ricercate, sviluppate e consolidate una serie di teorie specifiche dei mercati finanziari, sia di tipo scientifico/statistico sia di tipo non convenzionale come le teorie di Down, Elliott e Gann. A partire dal 1950 si è sviluppata la teoria dell'analisi tecnica, oggi molto popolare, che afferisce, a mio avviso, a teorie di mercato non efficiente.Prevede infatti l'uso di strumenti elementari derivati dalla matematica e dalla statistica, quali oscillatori/indicatori, che sono costruiti a partire dalle serie storiche dei titoli e su questi dati analizza e predice, entro certi limiti, l'evoluzione del prodottofinanziario. Fra questi si ricordano i famosi RSI, MACD, ROC ma anche i meno noti Williams %R, TRIX, le Bande di Bollinger, le Parabolic SAR ecc... Modello Random Walk e Teoria EMH La verifica sperimentale della teoria ha evidenziato contraddizioni nell'analisi dei rendimenti che contraddicono l'ipotesi del modello "Random Walk".

Modélisation de mouvements de foules Flots de gradient Considérons une personne perdue dans la montagne en plein brouillard, qui cherche à rejoindre la vallée au plus vite. On peut imaginer qu’elle tâtonne autour d’elle pour estimer dans quelle direction aller (en l’occurrence la direction de plus grande pente), fait un ou plusieurs pas dans cette direction, puis recommence le processus. Pour formaliser cette démarche, on décrit le profil de la montagne par une fonction $f({\bf x})$ qui représente l’altitude au point ${\bf x}$ du plan (on peut voir ce point ${\bf x}$ comme le couple latitude-longitude qui positionne un point à la surface du globe). Si l’on numérote par $1$, $2$,..., $n$,... les instants auxquels elle fait le point et par ${\bf x}_1$, ${\bf x}_2$,..., ${\bf x}_n$ les positions correspondantes, le parcours de notre promeneur est défini par \[ {\bf x}_{n+1} = {\bf x}_{n} -h \nabla f ({\bf x}_{n}), \] où $h$ est un paramètre qui quantifie la taille des pas. Modèle de foule Conclusion

English to French, Italian, German & Spanish Dictionary Copula (probability theory) Sklar's Theorem states that any multivariate joint distribution can be written in terms of univariate marginal distribution functions and a copula which describes the dependence structure between the variables. Copulas are popular in high-dimensional statistical applications as they allow one to easily model and estimate the distribution of random vectors by estimating marginals and copulae separately. There are many parametric copula families available, which usually have parameters that control the strength of dependence. Some popular parametric copula models are outlined below. Two-dimensional copulas are known in some other areas of mathematics under the name permutons and doubly-stochastic measures. Consider a random vector . are continuous functions. The copula of is defined as the joint cumulative distribution function of The copula C contains all information on the dependence structure between the components of whereas the marginal cumulative distribution functions The inverses and . .

BricoMaths FileCrop - Search and Download Rapidshare Megaupload and Hotfile Files Propositional calculus - Wikipedia Propositional calculus (also called propositional logic, sentential calculus, sentential logic, or sometimes zeroth-order logic) is the branch of logic concerned with the study of propositions (whether they are true or false) that are formed by other propositions with the use of logical connectives, and how their value depends on the truth value of their components. Logical connectives are found in natural languages. In English for example, some examples are "and" (conjunction), "or" (disjunction), "not” (negation) and "if" (but only when used to denote material conditional). The following is an example of a very simple inference within the scope of propositional logic: Premise 1: If it's raining then it's cloudy. Premise 2: It's raining. Conclusion: It's cloudy. Both premises and the conclusion are propositions. Premise 1: Premise 2: Conclusion: The same can be stated succinctly in the following way: History[edit] Propositional logic was eventually refined using symbolic logic. Argument[edit] .

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