Typically, the symbol is used in an expression like this: x R. R Markdown does not give substantial control over font size. Other useful LaTeX symbols and expressions in R Markdown. Similarly the letters given in the R Markdown file are c and q, but the output file prints c and d. For an unordered list, either an asterisk, a plus sign, or a minus sign may precede list items. The symbol is used in math to represent the set of real numbers. In those examples notice that for the ordered list, although the first-level numbers given in the R Markdown file are 1, 2, and 17, the numbers printed in the output are 1, 2, and 3. In your case you just have to use +- instead of the unicode Symbol \u00B1 so that R is able to coerce it to an expression. The set of real numbers symbol is the Latin capital letter R presented with a double struck typeface. Click on More symbols in the Symbols group. You can find it under the Design tab under Equation Tools.
In certain situations in mathematics and physics, it is common to use both a plus and a minus sign for a certain quantity, maybe because the procedure described can be explained for both signs at the same time, or because you are expressing some kind of uncertainty in physics. The following list of mathematical symbols by subject features a selection of the most common symbols used in modern mathematical notation within formulas. If you set parse TRUE the label will be displayed as described in plotmath.On the help page you can find a table with the avaiable features and the proper syntax. On the Insert tab, click the arrow under the Equation group within the Symbols group, and then click the Insert New Equation button.
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