What is the Nolting spin product of graphs?

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    even Vertex
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Discussion Overview

The discussion revolves around the Nolting spin product of graphs, specifically focusing on the definitions and implications of even vertices and the terms related to the partition function in the context of spin systems. Participants explore graphical representations and specific terms mentioned in a referenced text.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant references a specific relation in a text and seeks clarification on the concept of even vertices in the context of spin products.
  • Another participant defines an even vertex as one with an even order (2 or 4) and asserts that the spin products depicted in the referenced figure all vanish according to the definition.
  • A participant questions the significance of the term ##\upsilon^0##, wondering if it relates to a vacuum state.
  • The same participant raises a concern about the implications of having a partition function when the coupling constant J equals zero.

Areas of Agreement / Disagreement

There is some agreement on the definition of even vertices and the vanishing of spin products, but questions remain regarding the term ##\upsilon^0## and its implications for the partition function, indicating that the discussion is not fully resolved.

Contextual Notes

Participants have not fully explored the implications of the ##\upsilon^0## term or its relationship to the partition function, leaving some assumptions and definitions potentially unaddressed.

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An even vertex is a vertex whose order is an even number (2 or 4). Yes, the spin products in Fig. 6.13 all vanish according to the definition.
 
And what is with ##\upsilon^0## term? Is that like vacum?
 
LagrangeEuler said:
And what is with ##\upsilon^0## term? Is that like vacum?

What's the problem with it? You want to have the system to have a partition function in the case J=0, too, don't you?
 
Yes. Tnx.
 

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