Sizes of sets without cardinality notation |X| #109

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rzach opened this Issue Oct 25, 2016 · 1 comment

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rzach commented Oct 25, 2016

content/sets-functions-relations/size-of-sets/comparing-size.tex makes use of \card to compare sizes of sets. This leads students to think \card{X} makes independent sense, ie, there's something called the "size" of a set that can be compared, added, etc. This should be clarified.

  • instead of defining \card{X} \le \card{Y}, define a size-wise ordering eg X \preceq Y
  • add a remark that sizes (ie cardinal numbers) and an arithmetic on them can be defined but we're not defining them

rzach added a commit that referenced this issue Nov 12, 2016

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Ready to be fixed via commit a6a70a4

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rzach commented Nov 12, 2016

Ready to be fixed via commit a6a70a4

@rzach rzach changed the title from Sizes of sets without sizes to Sizes of sets without cardinality notation |X| Nov 13, 2016

rzach added a commit that referenced this issue Dec 18, 2016

rzach added a commit that referenced this issue Dec 18, 2016

@rzach rzach closed this Dec 18, 2016

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