How Do You Calculate the Multiplicity of a Two-Dimensional Ideal Monatomic Gas?

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The discussion focuses on calculating the multiplicity of a two-dimensional ideal monatomic gas. A formula was proposed, initially stated as 1/N!(A^N/h3N)(pi^3N/2/3N/2)!(sqrt(2mU))^3N, but identified as incorrect. The correct formula for the multiplicity is given as [(1/N!)*((A*pi)^N)*(2MU)^N]/ (h^2N)*(N!). The conversation emphasizes the importance of accurately representing the parameters involved in the calculation. Understanding these formulas is crucial for studying the statistical mechanics of gases in reduced dimensions.
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Consider an ideal monatomic gas that lives in a two-dimensional universe ("flatland"), occupying an area A instead of a volume V. Find a formula for the multiplicity of this gas.


I arrived at this formula. Is it correct?:

1/N!(A^N/h3N)(pi^3N/2/3N/2)!(sqrt(2mU))^3N
 
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its wrong:

it should be
[(1/N!)*((A*pi)^N)*(2MU)^N]/ (h^2N)*(N!)
 
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