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<Title><![CDATA[Mathematical Systems]]></Title>
<Notes><![CDATA[Chapter 5   Section 5 and Chapter 10]]></Notes>
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<SlideText><![CDATA[Mathematical Systems  Groups Chapter 5   Section 5 and Chapter 10 ]]></SlideText>
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<Title><![CDATA[The Real Numbers]]></Title>
<Notes><![CDATA[In-class Assignment 22 -1, 2]]></Notes>
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<SlideText><![CDATA[The Real Numbers The real numbers, R, is the set of all unending decimals. If the unending decimal repeats the number belongs to Q and is rational. 0.5 = 0.5000&  = 1/2 0.33333&  = 1/3 If the unending decimal does not repeat the number belongs to the set of irrational numbers. 1.41421& H" 	    . Symbols are used for irrational numbers.	 In-class Assignment 22 -1, 2 ]]></SlideText>
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<Title><![CDATA[Mathematical Systems]]></Title>
<Notes><![CDATA[No in-class assignment problem]]></Notes>
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<SlideText><![CDATA[Mathematical Systems A mathematical system is a set with one or more binary operations defined on it. A binary operation is a rule that assigns to 2 elements of a set a unique third element. If 5 and 7 belong to N and addition is the binary operation then 12 Is the unique  answer.                   5 + 7 = 12 If 4 and 4 belong to I and subtraction is the binary operation then 0 is the unique  answer.  4   4 = 0 No in-class assignment problem ]]></SlideText>
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<Title><![CDATA[Properties of Real NumbersClosure]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 3]]></Notes>
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<SlideText><![CDATA[Properties of Real Numbers Closure  If an operation is performed on any two members of the set and the result is a member of the set then the set is closed. If the set is W and the operation is subtraction then 7 " 12 does not belong to W.  W is not closed under subtraction. If the set is I and the operation is subtraction then 7 " 12 = "5. This implies I might be closed under subtraction. The set R is closed under addition and multiplication.  It is not closed under subtraction and division. In-class Assignment 22 - 3 ]]></SlideText>
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<Title><![CDATA[Properties of Real NumbersAssociative Property]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 4]]></Notes>
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<SlideText><![CDATA[Properties of Real Numbers Associative Property Given 3 numbers of the set in the same order and an operation the result is the same regardless of the grouping. (2 + 5) + 4 = 2 + (5 + 4) Notice   order is the same just the grouping is different.  7  + 4 = 2 + 9 (16      8)      2 `" 16     (8       2)  Generally the set R has the associative property under addition and multiplication but not under subtraction and division. In-class Assignment 22 - 4 ]]></SlideText>
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<Title><![CDATA[Properties of Real Numbers Commutative Property]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 5]]></Notes>
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<SlideText><![CDATA[Properties of Real Numbers  Commutative Property Given 2 numbers of a set and an operation the result is the same regardless of the order of the numbers. 5 + 6 = 6 + 5  but  4 " 2 `" 2 " 4  Generally the set R has the commutative property under addition and multiplication, but not under subtraction and division. In-class Assignment 22 - 5 ]]></SlideText>
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<Title><![CDATA[Properties of Real NumbersIdentity Property]]></Title>
<Notes><![CDATA[In-class assignment problem 22 - 6]]></Notes>
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<SlideText><![CDATA[Properties of Real Numbers Identity Property A set has the identity property if contains a unique element, a, such that the element in operation with any other element in the set in any order results in that number. Symbolically:  a + b = b + a = b 0 + 8 = 8 + 0 =8  and 1 x 15 = 15 x 1 = 15 Suggests 0 is the identity for addition and  1 is the identity for multiplication. 7 " 0 `" 0 " 7 and 9     1 `" 1      9  There is no identity element for subtraction or division. The identity property allows the operation to be performed without anything happening. In-class assignment problem 22 - 6 ]]></SlideText>
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<Title><![CDATA[Properties of Real NumbersInverse Property]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 7]]></Notes>
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<SlideText><![CDATA[Properties of Real Numbers Inverse Property A set under an operation, Ë%, has the inverse property if for each element, a, of the set there is another element, a-1, (called a inverse) such that a Ë% a-1 = a-1 Ë% a = identity. 7 + "7 = "7  + 7 = 0,  which is the additive identity 			     , which is the multiplicative identity,   The inverse property allows for the operation to be undone.                   In-class Assignment 22 - 7 ]]></SlideText>
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<Title><![CDATA[Determining Which Properties an Infinite Systems Has - Closure]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 8]]></Notes>
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<SlideText><![CDATA[Determining Which Properties an Infinite Systems Has - Closure E is {2, 4, 6, 8, & } and addition Closure    choose 2 numbers Add Does the answer belong to E? Repeat several times. 6 + 24 = 30,   30      E  246 + 12 = 258,  258     E  E may be closed under addition. In-class Assignment 22 - 8 ]]></SlideText>
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<Title><![CDATA[Determining Which Properties an Infinite Systems Has - Associative]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 9]]></Notes>
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<SlideText><![CDATA[Determining Which Properties an Infinite Systems Has - Associative E is {2, 4, 6, 8, & } and addition Choose 3 elements of E. Keep same order but different grouping. Are the answers the same? Repeat several times.  2+(12+8) = 2+20 = 22 (2+12)+8 = 14+8 = 22  (6+4)+8 = 10+8 = 18 6+(4+8) = 6+14 = 18  E may have the associative property under addition. In-class Assignment 22 - 9 ]]></SlideText>
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<Title><![CDATA[Determining Which Properties an Infinite Systems Has   Commutative]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 10]]></Notes>
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<SlideText><![CDATA[Determining Which Properties an Infinite Systems Has   Commutative E is {2, 4, 6, 8, & } and addition Choose any 2 elements of E. Add Change the order of the elements and add Are the answers the same? Repeat several times. 16+24 =40 24+16 =40  8+14 = 22 14+8 = 22  E may have the commu-tative property under addition. In-class Assignment 22 - 10 ]]></SlideText>
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<Title><![CDATA[Determining Which Properties an Infinite Systems Has - Identity]]></Title>
<Notes><![CDATA[In-class Assignment 22 - 11]]></Notes>
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<SlideText><![CDATA[Determining Which Properties an Infinite Systems Has - Identity E is {2, 4, 6, 8, & } and addition Choose any number in E. Try to find another number to add to the chosen number so that the answer is  the chosen.  An identity must work for all numbers of the set. If no identity then the set can have no inverse property.  10 +  ?    =  10  344 + ? = 344  Only 0 would work   so no identity.  E does not have the identity property under addition and no inverse property. In-class Assignment 22 - 11 ]]></SlideText>
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