How to Enter [x]/x on TI-84 Plus Calculator: Simple Notation Question

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Hello! I just was wondering how to enter [x]/x into my calculator to get a graph. When I try, I get a syntax error. Thank you for your help! BTW: I have a TI-84 plus!
 
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The simplest would be to write: \frac{\sqrt{x^{2}}}{x}
 
thank you!
 
Thread 'Use greedy vertex coloring algorithm to prove the upper bound of χ'

Thread 'Use greedy vertex coloring algorithm to prove the upper bound of χ'

Hi! I am struggling with the exercise I mentioned under "Homework statement". The exercise is about a specific "greedy vertex coloring algorithm". One definition (which matches what my book uses) can be found here: https://people.cs.uchicago.edu/~laci/HANDOUTS/greedycoloring.pdf Here is also a screenshot of the relevant parts of the linked PDF, i.e. the def. of the algorithm: Sadly I don't have much to show as far as a solution attempt goes, as I am stuck on how to proceed. I thought...
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