Euler's Formula for planar graphs - 1 or 2 ?

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  • Thread starter DaTario
  • Start date
  • #1
910
27
Hi All,
Regarding the Euler's formula Vertices - Edges + Faces = constant, for planar graphs what is the most frequent number? 1 or 2?

I understand that it is 2 when the outer region is included in the count.

Best wishes,

DaTario
 

Answers and Replies

  • #2
22,089
3,296
You can use either formula as long as you make it clear whether you include the outer region or not. I have most usually seen ##2## however.
 
  • #3
910
27
Thank you, micromass.
 

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