- #1
basichan
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Homework Statement
There are 2n points on a circle, we want to connect each two of them to make a pattern of connection in the way that there is no cross between the lines of connection, and all the lines have to be inside the circle and on the plane of the circle.
Question: How many different patterns of connection there are?
Homework Equations
This is a relevant question to count the number of planar Feynman Diagrams that without interaction insider a loop.
The Attempt at a Solution
we can check that in the case of n=1, there is 1 pattern, n=2, there are 2 different patterns, n=3, there are 5 different patterns.