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selfdefined operators


I have defined the operator \[CirclePlus] in the following way:

x_ \[CirclePlus] y_ := x y /(x + y)

When type in

1 \[CirclePlus] 2

I get 2/3 as the right result. But when I try to compute

1 \[CirclePlus] 2 \[CirclePlus] 3

the result will not be computed. How can I specify the operator in a
general way?





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