r-如何在rmarkdown编织到html的数学模式下写粗体希腊字母

Question

如何在rmarkdown编织到html的数学模式下写粗体希腊字母？我试过

---
title: "try bold greek"
author: "test"
date: "6/17/2021"
output: html_document
---
```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE)

\使用包｛bm｝

测试

测试1：$\mathbf｛\alpha｝$

测试2：$\bm｛\alpha｝$

测试3：$\alpha$

which renders no bold fonts at all:
"
Test 1: α
Test 2: bmα
Test 3: α
"

Answer 1

这应该有效：

$\boldsymbol｛\alpha｝$