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<p>You’re not the only one who doesn’t understand it. </p>
<p>Also, at the risk of sounding like a broken record, I still don’t understand why so many people are fixating on “basic math facts” in a thread about algebra and geometry. And why multiple people seem to have equated deriving concepts and axioms through pattern recognition with “singing kumbaya”, which is a complete straw man. If your kids are actually sitting around talking about how they feel about addition problems in math class, and I would certainly believe that it happens, then yes, you have a problem. But that doesn’t seem to be what this discussion was originally about.</p>
<p>Perhaps the “Discovering” books actually <em>are</em> inferior. I’ve never used them, I wouldn’t know. But I haven’t yet seen a satisfactory explanation as to <em>how</em> they are inferior.</p>