Finding Connected Graphs That Do Not Model a V-Sentence Phi

In summary, the main objective is to define a V-sentence that can generate arbitrarily large finite models and ensure that all finite models are connected graphs. This is followed by attempting to find a connected graph that does not satisfy the V-sentence. One approach is to consider different classes of connected graphs and try to find a simple first-order statement that characterizes them. However, it is important to note that these problems should be posted in the homework section with proper spelling, grammar, and definitions of any special terms.
  • #1
sara15
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how to define a V-sentence phi such that phi has aebitrarily large finite models and for any finite model G , G is a connected graph. after that to find a connected graph that does not model the sentence phi. please explain it to me.
 
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  • #2
You want to construct a first order statement about arbitrary vertices on a graph which, if it's true, gives a connected graph, and is not true for every connected graph.

Basically, the best way to approach this is to pick some classes of connected graphs (bipartite graphs, complete graphs, planar graphs, etc.) and see if you can find one which has a really easy characterization as a first order statement
 
  • #3
sara15 said:
how to define a V-sentence phi such that phi has aebitrarily large finite models and for any finite model G , G is a connected graph. after that to find a connected graph that does not model the sentence phi. please explain it to me.
This and the other two problems you posted look like homework. They should be posted in the homework section. When you post there, you should follow the guidelines there, which include showing your own work and not just asking other people to answer your questions. Also, as a general rule no matter where you post on the forum, you should use proper spelling and grammar, and define any special terms (e.g. what's a "V-sentence"?) so that it's easy for others to read.
 

FAQ: Finding Connected Graphs That Do Not Model a V-Sentence Phi

What is a "connected graph"?

A connected graph is a graph where there is a path between every pair of vertices. This means that all of the vertices in the graph are somehow connected to each other.

What does it mean for a graph to "not model a V-sentence Phi"?

A graph that does not model a V-sentence Phi does not accurately represent a logical statement in which there is a direct connection between the subject and predicate. In other words, the graph does not accurately depict a true relationship between the two elements.

Why is it important to find connected graphs that do not model a V-sentence Phi?

By identifying graphs that do not accurately represent logical relationships, we can improve our understanding of how to properly represent and analyze data. This can lead to more accurate and effective problem solving and decision making.

How do scientists determine if a graph models a V-sentence Phi or not?

Scientists use logical and mathematical reasoning to analyze the structure of a graph and determine if it accurately represents a V-sentence Phi. This may involve identifying patterns, using graph theory, and conducting experiments to test the validity of the graph.

What are the potential applications of finding connected graphs that do not model a V-sentence Phi?

Identifying these types of graphs can have applications in various fields such as mathematics, computer science, and data analysis. It can also help improve our understanding of logic and how to accurately represent relationships and data in different contexts.

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