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Solutions to Lab 4 exercises & Reflection

Written solutions

The written solutions for this week can be download as PDF below.

Download Solutions to Lab 4

Video explanations of some solutions

Videos for some questions from the green section are shown in the hints page.

Visit the Hints page

Please let me know if you want clarification on any other exercises.



  • How many methods of "proof" can you find?
  • What are your favourite ones?
  • Which ones you know (almost) nothing about?
  • Which ones do you expect will be used in this module?

You can use Wikipedia as a starting point.

Read the "Mathematical proof" article in Wikipedia


You don't have to hand-in your reflection -- this is not an assessment. Keep your notes and go over them as you understand the material more. Some of the above ideas will become clear in one week, while others will be met again towards the end of the module!