# How to let MathJax only apply bold to characters?

Correct but too many \mathbf: $$\mathbf X^*_{lm}\mathbf\cdot\mathbf E(\mathbf x)\tag1$$

One \mathbf but incorrect: $$\mathbf{ X^*_{lm}\cdot E(x)}\tag2$$

Is there something like \mathbfco (i.e. letter only):

\mathbfco{X^*_{lm}\cdot E(x)}

which can produce result in $$(1)$$?

• In $(1)$ I wonder why you wish to bold \cdot?
– TheSimpliFire Mod
Dec 7, 2020 at 13:37
• Indeed making the \cdot bold makes it wrong because the spacing is spoiled. Also it seems that the second one is working perfectly already as all the letters, even those subscripted are bold (matching the request to bold ‘letters only’) Dec 8, 2020 at 0:40
• @CalvinKhor I presume the OP's main complaint is that the asterisk and brackets (non-letters) as bolded. Although I have answered the question to get round it I really don't see why the OP is bothered by this.
– TheSimpliFire Mod
Dec 8, 2020 at 13:25
• To be honest I had no idea that the punctuation was bold. I only noticed that the subscript was not bold and was confused; after all, the subscript is composed of letters but it seems they may? Or may not? Want them bold Dec 8, 2020 at 15:34
