Showing posts with label Natural numbers. Show all posts
Showing posts with label Natural numbers. Show all posts

Tuesday, April 9, 2013

Study About Countable


Introduction to study about countable:
Countable is natural number sets.It is denote how many number of variables are present.If there is no countable values means it is called as uncountable.In countable set, we can count the numbers  only once.Injective function is exist in set.It is called countable set.It is defined by f:S`->` N.N={0,1,2,….}.Some theorems are used to derive the contable set.

Theorem: In this theorem, consider a set as S and following conditions should be equal.

1). S is countable. That is f:S`->` N.

2). If subjective function is exist in set or empty means  g:N`->` S.

3). If bisection is exist in set of finite means  h:N`->` S.

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study about countable-Formal introduction


For more information, we study the the some theorems.

Study the countable by formal introduction:

Theorem 1: Cartesian product of finitely many countable sets is countable.

Repeated mapping is generate the finite vectors to natural numbers.Natural numbers easily  map the positive rational numbers.One or more than mapping method is used.

Theorem 2: This define countable set is consider allevery subset.

Prime number set is countable. For example, 2 maps to 1 and 3 maps to 2.

Theorem 3: Rational numbers are countable.

All fractions set are defined.Integers are represented by a and b.For example, 0 maps to (0,1,0) and 3 amps to(3,1,0).

Theorem 4: Natural number sequence is finite length set.It has length sequence 1,2,3.

Theorem 5: All finite subsets are countable.Order the elements when we have a finite subset.

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Study the properties of countable:

Basic theorem: It has three conditions.The basic theorem differentiate the sets as finite and infinite.

Corollary: Consider S and T sets.

1). F:S`->` T is injective ,where countable is T and then countable is S.

2). G:S`->` T is surjective and countable is S and then countable is T.

Study the Cantor’s enumeration is defined collection of countable sets.It is also called denumerable set.If we want to resolve the problem means we can use at most countable.We can study the orders of countable by using some methods.Well orders is used to ordered totally.It has another ways that is normal order of integers of rational numbers.

Friday, March 22, 2013

Study 7th Grade Pre Algebra


Introduction to pre algebra:

Algebra: Algebra deals with the symbols,usually letters of the alphabet, are used to represent numbers and quantities.

Algebraic expression: a quantity that combines variables, numbers, and operation symbols.

Area: the space occupied inside a two-dimensional shape.

Equation: a mathematical statement in which two or more expressions are set equal to each other.

Inequality: a mathematical statement comparing two or more expressions using <, >, ≤, and ≥.

Like terms: two or more terms that have the same variable raised to the same power.

Linear equation: an equation that represents a line.

Polynomial: an expression made up of terms containing variables with whole number exponents.

Probability: a number from 0 to 1 that gives how likely anevent is to happen.

Real number: any number that can be represented with a point on the real number line.

Solution of an Equation: the value that makes an equation true when the variable is replaced by the value.

Term: a variable, number, or the product of a number and a variable

Variable: a symbol that is used to represent a quantity.

Volume: the amount of space enclosed in a solid object.

I like to share this free math word problems 5th grade with you all through my article.

Pre algebra includes different topics:


Natural numbers, arithmetic
Integers, fractions, decimals and negative numbers
factorization of natural numbers
Properties of operations such as associative property, distributive property and commutative property
Roots and powers
Evaluating expressions, such as operator precedence and use of parentheses
Basics of equations, that includes rules for invariant manipulation of equations
Variables and expressions.

Example:


Evaluate the expression for the given values.
2m – 3n + 7 for m = 8 and n = 5
Solution:
2m – 3n + 7 = 2(8) – 3(5) + 7
= 16 – 15 + 7
= 8

2) Evaluate 3x+ 4y - 12 for x =2 and y = - 3

Solution:

=  3(2)+4(-3) -12

= 6-12 -12

= 6 - 24

= -18

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Practice problems for pre algebra:


Evaluate the expression for the given values, 5x – 2y + 13 for x = 3 and y = 7
Evaluate the expression for the given values, 2p – 3q + 56 for p = 7 and q = 3
Evaluate the expression for the given values, 8m – 13n – 18 for m = 7 and n = 5.