# Textbook Notes for Computer Science at Brandeis University

## COSI 11a Chapter Notes - Chapter 1: Subroutine

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BRANDEISCOSI 155bTim HickeySpring

## COSI 155b Chapter Notes - Chapter 2: Well-Ordering Principle

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BRANDEISCOSI 29aCherniack MitchFall

## COSI 29a Chapter Notes - Chapter 1.2: Bitwise Operation

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A 1 bit represents true and a 0 bit represents false. Often, programs represent (cid:1513) as or, (cid:1512) as. A bit string is a sequence of bits, an
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## COSI 11a Chapter Notes - Chapter 2.1 and 2.2: Pariah Dog, Subroutine

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BRANDEISCOSI 155bTim HickeySpring

## COSI 155b Chapter Notes - Chapter 4: Symmetric Difference

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Every set a exists within some universe u. The complement of a is written as ac . The elements in set ac is any element in the universe u that is not a
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BRANDEISCOSI 29aCherniack MitchFall

## COSI 29a Chapter Notes - Chapter 1.1: Exclusive Or, Contraposition, Logical Biconditional

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A declarative sentence that is either true or false. Ex: the negation of today is friday is today is not friday . The negation of a proposition (p) is
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## COSI 11a Chapter Notes - Chapter 2.3: String Literal, Subroutine

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BRANDEISCOSI 155bTim HickeySpring

## COSI 155b Chapter Notes - Chapter 3: Power Set, Empty Set, Subset

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If a is a subset of b, then every element in a must also be in b. Note: if a , then the subset a can be equal to b, unlike a where a must be smaller th
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BRANDEISCOSI 155bTim HickeySpring

## COSI 155b Chapter Notes - Chapter 1: Empty Set, Cardinality

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Introduction to set theory: a set is a collection of objects called elements, sets can be finite or infinite, ex. Z+ = {1, 2, : note: z+ is the positiv
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## COSI 11a Chapter Notes - Chapter 3: Substring

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