CSCI 250 Spring 2013
Discrete Structures
Archived Class
Charles Cusack
Computer Science
Hope College
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Homework 5

Comments

  • Problems are taken from the textbook unless otherwise noted.
  • For full credit, provide context for each problem, show all calculations, and justify all answers by providing enough comments to explain your reasoning.
  • You will lose a significant amount of credit if you do not provide context, calculations, and justifications for a problem.
  • Numbers and/or algebra by themselves are not enough. A correct answer with no justification will be worth no more than half credit, and sometimes much less than that.
  • Precision is very important. You cannot skip steps, make guesses, or use flawed logic. Any of these things can lead to incorrect answers.
  • Homework assignments must be very neatly written or typeset (e.g. using Word or OpenOffice).
  • You must indicate any assistance/collaboration you had on an assignment as specified on the Policies page.

Details

SectionProblemNotes
2.130Prove your conclusion.
36
2.212Use a "set containment proof". See Examples 10 and 12. Your proof should contain phrases like "Let x∈FOO", "by the definition of union", "thus FOO⊆FERZLE", etc.
16aSee note for the previous problem.
52
58This is asking two separate questions—one about unions and the other about intersections. It is not asking about doing both at the same time since it is unclear what that would even mean.