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Comments in green were written by me. Comments in blue were not written by me.
If we could just teach young children about positive and negative numbers, then this wouldn't be a problem. Subtraction is just the addition of negative numbers. Division is also the multiplication of fractions. This is why BOMA/PEMA is the optimal method. I think MEDUSA is very creative, though.
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A surprising fact about quadrilaterals
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Log-scaled axes

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PhD thesis, chapter ∞
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PhD thesis, chapter 1
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