⊕ is supposed to be a circled plus, and appears so in Firefox, but not in IE7.
Leibniz' addition seems to be very like a projection; I wouldn't think it would be easy to define an inverse. Well, you say he didn't find it workable; I guess it wasn't. ;<}
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Date: 2007-08-26 01:58 pm (UTC)Leibniz' addition seems to be very like a projection; I wouldn't think it would be easy to define an inverse. Well, you say he didn't find it workable; I guess it wasn't. ;<}