Cara Sederhana Merawat Kulit Agar Bersih dan Tidak Kusam

Cara Sederhana Merawat Kulit Agar Bersih dan Tidak Kusam

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Memiliki kulit yang sehat dan bersih tentu menjadi dambaan semua wanita, dengan memiliki kulit yang tidak kusam tapi bersih maka akan terlihat lebih cantik dan anggun. Namun bagaimana jika kulit kita ternyata tampak kusam? Banyak memang kosmetik-kosmetik diluar sana yang … Continue reading →

Introduction of Sets Theory

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Definition
 

A set is a collection of individual elements in the domain . The universal set contains every element in . The null set contains no element.

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 If is a set in the domain , must be a subset of the universal set , denoted as .

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 If consists of some but not all elements, is then called a proper subset of , denoted as .
 
Unions, Intersections, Complements
 

The definition of union (“or“), intersection (“and“), and complement (“not“) can be illustrated by Venn Diagrams as follows:

Suppose that A and B are two sets in the same domain whose universal set is .

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 The union of A and B consists of all elements which belong to either A or B, denoted by .

 

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 The intersection of A and B consists of only elements which belong to both A and B, denoted by .

 

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 The complement of A consists of elements which do not belong to A, denoted by .
 
Important Properties
 

Distributive Laws

De Morgan’s Laws