Although the question may seem very simple, I want to ask it because I wish to learn. I use a lot of packages for my book and unfortunately someone goes into conflict. For example, I can't use bm package. I was wondering because even if I put or not put a blank space after 2 to the symbol/command \boldsymbol{\mathcal{U}}, it doesn't separate (see picture). For the symbol \cdot next to the symbol \boldsymbol{\mathcal{A}} the blank space exists because I think the first one is an operator and the other one is a character. The empty space is created by default. My question is: to create space in these cases I must necessarily use space \,?

Here there are my MWE and the image:

enter image description here

2 \boldsymbol{\mathcal{U}} \cdot \boldsymbol{\mathcal{A}}
  • 3
    Shape conflicts should be solved on a case by case analysis: in this case 2\,\boldsymbol{U} seems necessary; probably not for 2\boldsymbol{A}. – egreg May 10 at 11:21
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    \, might be a bit too much, try \mkern1mu\boldsymbol{\mathcal{U}} (\, is 3mu normally) – David Carlisle May 10 at 11:23
  • @DavidCarlisle and egreg: Mine is just a mere curiosity and I thank you very much for your comments.Please could you give me an answer instead of a comment. Thank you very much. – Sebastiano May 10 at 11:24
  • @egreg I also appreciate any response you may have. Best regards. – Sebastiano May 10 at 11:34

You need to do this manually, although of course you can define macros for the common ones in any document. \, might be a bit too much (although it is personal judgement) perhaps

2 \mkern1mu\boldsymbol{\mathcal{U}} 

(\, is 3mu normally)

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