Bookdown pdf output: less equal symbol in a table

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I'm writing a book using the bookdown package. I have a table that contains the less equal symbol with the $\leq$. When I render the book in HTML the symbol is visualized but I have to add one slash more $\\leq$. When i render the book in pdf the symbol is not rendered. How can I solve this?

My r code for the table:

```{r, echo=FALSE}

table_vo2max_donne <- data.frame(Età = c("20-29", "30-39", "40-49", "50-59","60-69", "70-79"),
                       Basso = c("$\\leq$ 35","$\\leq$ 33", "$\\leq$ 31", "$\\leq$ 28", "$\\leq$ 25", "$\\leq$ 23" ),
                       Normale = c("36-39", "34-36", "32-34", "29-30", "26-28", "24-26"),
                       Buono = c("40-43", "37-40", "35-38", "31-34", "29-31", "27-29"),
                       Ottimo = c("44-49", "41-45", "39-44", "35-39", "32-36", "30-36"),
                       Eccellente = c("50+", "46+", "45+", "40+", "37+", "37+")
                       )
knitr::kable(table_vo2max_donne, caption = "Classificazione del fitness cardio-respiratorio:")

 ```

The output in HTML is: Table rendered in HTML format

The output in PDF is: Table rendered in PDF format

Thanks in advance,

Marco

bookdown r-markdown r pdf
1 Answers

As suggest by @stefan it's important to add escape = FALSE to the knitr::kable command. So adding:

knitr::kable(table_vo2max_donne, caption = "Classificazione del fitness cardio-respiratorio:", escape = FALSE)

Render the table in the right way. Thank to @stefan for the help.

user_101572080
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