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 Aug 14 comment Is addition more fundamental than subtraction? @AustinMohr: I'll keep that in mind. Sorry about that. Aug 14 comment Is addition more fundamental than subtraction? @Drise: completely equivalent after the isomorphic transformation. So in Math speak: completely equivalent. Aug 14 comment Is addition more fundamental than subtraction? Reversing the two concepts just leaves you with two isomorphic concepts that does not answer the question. Aug 14 asked Is addition more fundamental than subtraction? Jul 31 comment What's the meaning of the unit bivector i? @draks that is not geometric algebra. That's Dirac algebra which only makes sense in Dirac theory. Geometric algebra promises (I'm still learning) to be applicable/useful everywhere, not just in the case of $\gamma$s. And an index $i$ is nothing evil. Jul 31 awarded Critic Jul 31 comment What's the meaning of the unit bivector i? @celtschk OK. But Hestenes maintains quaternions are just an aspect/transformation/... of the more general geometric algebra (at least in sofar they are used in Physics). I can't deduce any geometric meaning from quaternions either, so although insightful, it doesn't help me much (probably why you made it a comment anyways ;-)). Jul 31 comment What's the meaning of the unit bivector i? OK. This is part of the meaning I get. The bivector as an operator is a rotor. But the bivector as basis element of the algebra should have a meaning on its own. Is my plane interpretation correct? Jul 31 comment What's the meaning of the unit bivector i? It seems you avidly hate Hestenes' formulation. I get the parallel with $\gamma$ algebra the way you see it (I first came into contact with geometric algebra when studying the Dirac equation), but in the pdf referenced, he's not talking about $\gamma$ algebra, he's talking Euclidean geometry, where stuff like $\gamma$-matrices (he's not even talking about matrices) are not even relevant. You're giving a non-geometric interpretation IMHO, which is not quite what I'm after. I'm after the interpretation Hestenes describes. Jul 30 comment What's the meaning of the unit bivector i? If someone would be so kind to tag this with a new tag geometric-algebra, I'd appreciate it. Jul 30 asked What's the meaning of the unit bivector i? May 17 awarded Popular Question Nov 21 accepted Create list of {x,f(x)} pairs Nov 21 accepted A function of two functions that loses dependence on an argument Nov 9 awarded Commentator Nov 9 comment Create list of {x,f(x)} pairs Funny how the (IMHO) much worse pops up in comments under my answer :) Nov 9 answered Create list of {x,f(x)} pairs Nov 9 asked Create list of {x,f(x)} pairs Nov 7 comment A function of two functions that loses dependence on an argument Craig: see edit, my case here is really an addition of sorts, so no undefined things pop up. Nov 7 revised A function of two functions that loses dependence on an argument multiplication->addition