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Hello everyone, I'm trying to look at Mumford's Paper, 'The Pathologies of Modular Surfaces'Surfaces.(link: http://www.dam.brown.edu/people/mumford/Papers/DigitizedAlgGeomPapers--ForNon-CommercialUse/61b--Path1.pdf) On page 341, section II . he says a certain surface can be constructed as the join of 3 graphs $E_0 \rightarrow \mathbb{P}^1$-what mathbb{P}^1$. What is the join of graphs? Cheers!
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Question about Terminology in MumfordHello everyone, I'm trying to look at Mumford's Paper, 'The Pathologies of Modular Surfaces'. (link: http://www.dam.brown.edu/people/mumford/Papers/DigitizedAlgGeomPapers--ForNon-CommercialUse/61b--Path1.pdf) On page 341, section II. he says a certain surface can be constructed as the join of 3 graphs $E_0 \rightarrow \mathbb{P}^1$-what is the join of graphs? Cheers!
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