Ita Kate Fill in each section of the Venn Diagram What is a - - PowerPoint PPT Presentation

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Ita Kate Fill in each section of the Venn Diagram What is a - - PowerPoint PPT Presentation

Lets Begin with an Activity Ita and Kim Kim, Ita Partner up with 2 of your neighbors eat croissants and Kate Kim every morning love Find out your similarities and Artemis! differences. (Do you all like chocolate ice cream?


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Let‟s Begin with an Activity

Kim Kate Ita

  • Partner up with 2 of your neighbors
  • Find out your similarities and
  • differences. (Do you all like

chocolate ice cream? Have you read Harry Potter? Etc…)

  • Fill in each section of the Venn

Diagram Kim, Ita and Kate love Artemis! Ita and Kim eat croissants every morning

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What is a Set?

A set is a collection of distinct objects.

Example: {Book, Chair, Pen}

In a set, order does not matter

Example: {Book, Chair, Pen} = {Pen, Book, Chair}

Your Venn Diagram is made of 3 sets of words describing you and your partners

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Two Important Sets

Empty (Null) Set: A set with no elements

Denoted by  or {}

Universal Set: A set that contains all objects in the universe

Denoted by Ω

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Elements

The objects in a set are called “elements” Let S = {Emily, Kimerah, Katherine} Emily is said to be “an element of” set S because she is part of that set The shorthand notation for this is ‟∈‟ “Emily ∈ S” translates to “Emily is an element of set S”

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Basic Operations

Union: The union of 2 sets is all the elements that are in both sets

Denoted by „U‟ Example: Let A={1,2,3} and B={1,4,5} AUB = {1, 2, 3, 4, 5}

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Basic Operations

Intersection: The intersection of 2 sets is the set of elements they have in common

Denoted by „∩‟ Example: Let A={1,2,3} and B={1,4,5} A∩B = {1}

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Basic Operations

Set Difference: The set of elements in one set and not the other

Denoted by „\‟ Example: Let A={1,2,3} and B={1,4,5} A\B = {2, 3}

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Back to your Venn Diagram

Identify …

the union the intersection the set difference

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Solutions: Union

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Solutions: Intersection

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Solutions: Set Difference

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Why is Set Theory Important?

It is a foundational tool in Mathematics The idea of grouping objects is really useful

Examples: Complexity Theory: Branch in Comp. Sci. that focuses on classifying problems by difficulty.

I.e. Problems are sorted into different sets based on how hard they are to solve

The formal, mathematical definition of Probability is defined in terms of sets

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SET: The Game

Rules

Each card is unique in 4 characteristics: color, shape, number, and shading 3 cards form a SET if each characteristic is the same for all cards or different for all cards Yell SET to claim cards Player with the most SETs wins

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This is a SET

COLOR: ALL red SHAPE: ALL ovals NUMBER: ALL twos SHADING: ALL different

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This is NOT a SET

SHAPE: ALL Squiggly NUMBER: ALL twos SHADING: ALL different COLOR: NOT ALL red  NOT a SET

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Is this a SET?

SHAPE: ALL different NUMBER: ALL different SHADING: ALL striped COLOR: ALL different

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Is this a SET?

SHAPE: ALL diamonds NUMBER: ALL ones COLOR: ALL different SHADING: NOT ALL hollow Magic Rule: If two are _______ and one is not, then it is not a SET

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Let‟s Play!