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Peculiar output from DSolve


In:  DSolve[y*D[u[x, y],x] == x*D[u[x, y],y], u[x,y], {x, y}]

Out:  {{u[x, y] -> C[1][(1/2)*(x^2 + y^2)]}}

Square brackets are used as grouping symbols in the result!??  :^O

Somebody say it isn't so.

---
Selwyn Hollis



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