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A user wondered how to have Maple produce a desired form of a solution

eq1 := `σ__2` = P__2/(Pi*r^2)NULL

NULL

r := (1/2)*d

NULL

soln := `assuming`([solve(eq1, {d}, useassumptions)], [`σ__2`::real, d > 0, P__2 > 0])

{d = 2*(Pi*sigma__2*P__2)^(1/2)/(Pi*sigma__2)}

 (1)

NULL

Parse:-ConvertTo1D, "first argument to _Inert_ASSIGN must be assignable"

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We suggested the closest they might be able to get is using simplify like so:

 

restart; eq1 := `σ__2` = P__2/(Pi*r^2)
``

``

r := (1/2)*d

``

soln := `assuming`([solve(eq1, {d}, useassumptions)], [`σ__2`::real, d > 0, P__2 > 0])

{d = 2*(Pi*sigma__2*P__2)^(1/2)/(Pi*sigma__2)}

 (1)

``

`assuming`([simplify(soln)], [sigma__2::real, P__2 > 0])

{d = 2*P__2^(1/2)/(Pi^(1/2)*sigma__2^(1/2))}

 (2)

NULL


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simplify

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