# Difference between revisions of "Main Page"

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## Notes

Do varietal wines, e.g. pure cabernet sauvignon, make sense? It seems like a blend of grapes with different properties *has* to be better, e.g. one for color, one for aroma, one for body. Is it that with the varietal, at least one knows there's no rotgut cheap grape involved?

Although the symbols {\displaystyle \mathbb {R} _{+}}\mathbb {R} _{+} and {\displaystyle \mathbb {R} ^{+}}{\mathbb {R}}^Template:+ are ambiguously used for either of these, the notation {\displaystyle \mathbb {R} _{+}}\mathbb {R} _{+} or {\displaystyle \mathbb {R} ^{+}}{\mathbb {R}}^Template:+ for {\displaystyle \left\{x\in \mathbb {R} \mid x\geq 0\right\}}{\displaystyle \left\{x\in \mathbb {R} \mid x\geq 0\right\}} and {\displaystyle \mathbb {R} _{+}^{*}}{\displaystyle \mathbb {R} _{+}^{*}} or {\displaystyle \mathbb {R} _{*}^{+}}{\displaystyle \mathbb {R} _{*}^{+}} for {\displaystyle \left\{x\in \mathbb {R} \mid x>0\right\}}{\displaystyle \left\{x\in \mathbb {R} \mid x>0\right\}} has also been widely employed, is aligned with the practice in algebra of denoting the exclusion of the zero element with a star, and should be understandable to most practicing mathematicians.

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