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Variable (mathematics) - Wikipedia, the free encyclopedia

  
Beyond mathematics, "X" has come to represent a generic placeholder variable whose value ... In mathematics, variables are essential because they let quantitative ...
http://en.wikipedia.org/wiki/Variable_(mathematics)

Math Variables & Expressions | eHow.com

  
In mathematics, variables are used within mathematical expressions, and are most commonly denoted by the letter "X," which originates from the ancient ...
http://www.ehow.com/about_4868787_math-variables-expressions.html

Variable (mathematics) financial definition of Variable ...

  
What is Variable (mathematics)? Meaning of Variable (mathematics) as a finance term. What does Variable (mathematics) mean in ...
http://financial-dictionary.thefreedictionary.com/Variable+(mathematics)

Abstract Math: Variables and Substitutiion

  
A variable is a symbol (usually a Roman or Greek letter) that denotes a ... But in abstract math, variables can vary over any type of mathematical object or ...
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JavaScript Variables

  
Free HTML XHTML CSS JavaScript DHTML XML DOM XSL XSLT RSS AJAX ASP ADO PHP SQL tutorials, references, examples for web building.
http://www.w3schools.com/js/js_variables.asp

Variables & Math Questions

  
Variable Casting and Math operations. Q. What can I store in Integer, Floating Point# or ... This classifies the variable to PlayBasic as being of string type. ...
http://www.underwaredesign.com/forums/index.php?topic=1651.0

Random Variable - Math Dictionary

  
A random variable is a function that assigns numeric values to the outcomes of an experiment. In general, a random variable is written as a capital X or Y etc
http://www.icoachmath.com/Controls/RandomVariable.html

Talk:Variable (mathematics) - Wikipedia, the free encyclopedia

  
This article is within the scope of WikiProject Mathematics, a collaborative effort ... Variable for the common discussion history of Variable (mathematics) ...
http://en.wikipedia.org/wiki/Talk:Variable_(mathematics)

Independent Variable - Math Dictionary

  
In other words, an independent variable in an equation may have its value freely chosen regardless the values of any other variable. ...
http://www.icoachmath.com/SiteMap/Independent_variable.html

variable - definition of variable by the Free Online ...

  
Information about variable in the free online English dictionary and encyclopedia. ... 2. Astronomy A variable star. 3. Mathematics. a. A quantity capable of assuming any of a ...
http://www.thefreedictionary.com/variable
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 Questions 'n' Answers about 'Variable (mathematics)' Opens New Window.

Q.Why is "x" the most commonly used variable in mathematics?Related Search:
Mathematics
 I need to know why is "x" the most commonly used variable in mathematics. I tried looking it up by websearch. But it just wont work.
A.It is derived from the Cartesian coordinate system which denotes the three directions of Cartesian space as X,Y and Z. Simple algebraic equation that use X are one dimensional and are plotted along the X axis. That is also why you see x, y and z used in algebraic equations. Now, the question is how did X, Y and Z get chosen for the Cartesian coordinate system. You now have a place to search--i.e., Google "origins of cartesian coordinate system."
  

Q.what is the difference between a random vector and random variable in statistical mathematics?Related Search:
Mathematics
 My teacher confuses me by saying x is a random variable and sometimes by saying x is a random vector.
A.The terms can be used interchangeably but one has to be careful since a multivariable random variable is a random vector For example: 1.A random variable is a function say X=(X1) 2.However a multivariate random variable is random vector X = (X1, ..., Xn). I hope that answers your question.
  

Q.Probability Mathematics help Poisson random variable?Related Search:
Mathematics
 Need help on this problem. The number of page requests that arrive at a web server is a poisson random variable with an average of 6000 requests per minute. a) find the probability that there are no requests in a 100 millisecond period. b) Find the probability that there are between 5 and 10 requests in a 100millisecond period
A.6000 requests per minute equals 100 requests per second, or 10 requests per 100 millisecond period. The probability of getting k requests during that period is: P(R = k) = λ^k*e^(-λ)/k! where λ = 10 a) P(R=0) = 10^0*e^(-10)/0! = e^(-10) = 0.0000454, or 0.004% b) P(5≤R≤10) = Σ(i=5 to 10)P(R=i) P(5≤R≤10) = e^(-10)*(10^5/5! + 10^6/6! + 10^7/7! + 10^8/8! + 10^9/9! + 10^10/10!) = 0.554, or 55.4%
  

Q.Probability Mathematics Poisson random variable help?Related Search:
Mathematics
 Need help. I don't really understand poisson random variables. a represents alpha For the poisson random variable show that a<1, P[N = k] is maximum at k = 0; for a>1, P[N=k] is maximum at [a]; and if a is a positive integer, then P[N=k] is maximum at k=a, and at k=a-1.
A.For a Poisson variable with a parameter "a", you have: P(N=k) = a^k*e^(-a)/k! The maximum for your random variable is the value k that verifies: P(k) ≥ P(n) for any integer n if a<1, for any integer k, you have: a/(k+1) < 1/(k+1), and since k≥0, 1/(k+1)≤1, so a/(k+1) < 1 you know that P(N=k+1) = a^(k+1)*e^(-a)/(k+1)! = (a/(k+1))a^k*e^(-a)/k! = (a/(k+1))P(N=k) since (a/(k+1)) <1, (a/(k+1))P(N=k) < P(N=k) hence P(N=k+1) < P(N=k) for any integer k. The maximum is then at k = 0. P(N=0) = e^(-a) if a>1 a < Floor(a) + n for any integer n ≥ 1 a/(Floor(a)+n) < 1 So P(N = Floor(a)+n) < P(N=Floor(a)+n-1) for any n≥1 Because of the transitivity of this relation, this means P(N=Floor(a)+n) < P(N=Floor(a)) for any n≥1 Call this relation (1) similarly, for 0≤n≤Floor(a)-1 you have P(N=Floor(a)-n) = a/(Floor(a)-n)P(N=Floor(a)-n-1) and a>Floor(a)-n for any integer n≥0 (exception: if a is an integer, a = Floor(a), a/Floor(a) = 1 and the relation is only valid for n≥1) so a/(Floor(a)-n)>1 for any integer n≤Floor(a)-1 (n>0 if a is an integer) finally, P(N=Floor(a)-n) > P(N=Floor(a)-n-1) for any integer 0≤n≤Floor(a)-1 (0<n≤a-1 if a is an integer) P(N=Floor(a)-n) < P(N=Floor(a)) by transitivity for any integer 1≤n≤Floor(a) (if a is an integer the relation is only valid if n>1) Call this relation (2) Because of (1) and (2), we see that P(N=Floor(a)) is the maximum value of your distribution when a>1 if a is a positive integer, Floor(a) = a and we have for any integer n>0: P(N=a+n) < P(N=a) (relation(1)) and for any integer 1<n<a-1 P(N=a-n)<P(N=a) (relation (2)) k=a is still a local maximum, and the only other value we don't know about is k=a-1. P(k=a) = a^ae^(-a)/a! = a*a^(a-1)e^(-a)/(a*(a-1)!) = a^(a-1)e^(-a)/(a-1)! = P(k=a-1) a and a-1 are both maxima for the distribution if a>1 and a is an integer.
  

Q.in mathematics my teacher says a variable can assume any value.?Related Search:
Mathematics
 my question is when i go for an exam why there is only one answer,
A.yes. it can assume any value. because, if the VARIABLE is used in an EQUATION. then there can be a definite answer. for example: (having x as a variable) if I ask you what "x" is. can you tell me the answer? yes! you can give me any number and you would be correct. but if i put "x" into an equation. like this one: x+1=5 and i ask you what "x" is. you cannot give me any number that comes to mind. you have to solve for "x" using the equation. like this: x+1=5 x=5-1 x=4 so in this case. there can be only one answer to x. that is why you get only one answer. if exams didn't put variables in equations. everybody would get perfect scores and would not be able to test if students are listening to their teachers. teachers would have a harder time finding out if students learned what they are supposed to learn... hehe.
  
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  • Variable (mathematics)
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  • Free variables and bound variables
    mathematical logic and computer science , a free variable is a notation that specifies places in an expression where substitution may take place. ...
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  • Propositional variable
    In mathematical logic , a propositional variable (also called a sentential variable or sentential letter) is a variable which can either be ...
    2 KB (197 words) - 17:48, 17 February 2010
  • Metasyntactic variable (section Mathematical analogy)
    In logic , mathematics and computer science , a metasyntactic variable. (ˌmɛtəsɪnˈtæktɪk ˈvɛəriəbl. (also metalinguistic variable) is a ...
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  • Separation of variables
    In mathematics separation of variables is any of several methods for solving ordinary and partial differential equation s, in which algebra ...
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  • Expression (mathematics) (section Variables)
    In mathematics, the word expression is a term for any well-formed combination of mathematical symbols ,variables and constants date July ...
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  • Change of variables
    In mathematics, a change of variables is a basic technique used to simplify problems in which the original variables are replaced with new ...
    4 KB (741 words) - 21:47, 12 March 2010
  • Power series
    In mathematics , a power series (in one variable) is an infinite series of the form: f(x) \sum_n 0^\infty a_n \left( x-c \right)^n a_0 + a_ ...
    13 KB (1,692 words) - 03:32, 26 February 2010
  • Substitution of variables (redirect from Substitution principle (mathematics))
    In mathematics, substitution of variables (also called variable substitution or coordinate transformation) refers to the substitution of ...
    5 KB (737 words) - 11:03, 11 March 2010
  • Function of a real variable
    In mathematics , a function of a real variable is a mathematical function whose domain is the real line . function of a real variable is ...
    1 KB (188 words) - 06:02, 17 December 2009
  • Complex variables
    In mathematics , the term complex variables may be taken to mean either. Complex analysis , or. Several complex variables -
    586 B (18 words) - 20:48, 7 May 2009
  • Quaternion variable
    In mathematics , a function of a quaternion variable is a function with domain and range in the quaternions H. The projections of a ...
    7 KB (962 words) - 14:13, 5 January 2010
  • Indeterminate (variable)
    In mathematics , and particularly in formal algebra , an indeterminate is a symbol ... it is not a variable designating a function argument, ...
    1 KB (234 words) - 13:17, 30 January 2010
  • Variable
    Variable may refer to: Variable (mathematics), a symbol that stands for a value that may vary. Variable (programming), a symbolic name ...
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    Proportionality (mathematics), the relationship of two variables whose ratio is constant. Proportionality (law), a legal principle under ...
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    In the mathematical theory of functions of one or more complex variables , and also in complex algebraic geometry , a biholomorphism or ...
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