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These files are maintained strictly for historical reference, research, and recordkeeping purposes,
and the content has not been altered or updated since archiving.
Content on this site may not meet current digital accessibility standards.
If you require an alternative, accessible format of any information found on this site,
please contact Bruce Jones, bjones@ucsd.edu to request an accommodation.
Andy Blunden wrote on the "math social-construction" thread:- > On a side note, a lot of people calling on various metaphors > to justify -x-=+ have never addressed the question a kid > might ask as to why the example given doesn't prove that a - > when **added* to a - gives a +. I certainly had kids > confront me with that one. It is very easy to skate over the > hidden equation of multiplication with intersection and > compounding and so on which to a lot of non-mathematicians > looks much more like addition. The link between these > operations is obviously NOT arbitrary, is it? But nor is it > obvious, _______________________________________________ xmca mailing list xmca@weber.ucsd.edu http://dss.ucsd.edu/mailman/listinfo/xmca