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Importing a Single Symbol From a Different Font

Is there a command like \mathfont[font]{}, which enables me to use a different mathematical font for everything inside the parenthesis { } ?

I want for example to use \mathfont[txfonts]{$\mathbb{I}$}, so that just the blackboard symbol for "I" is display using the txfonts font, while the rest of my text uses the usual computer modern latex font.

I know there are similar questions and answers, but I can't get anything out of them, since to apply them, I have to know slot in the font of the symbol I'd like to import.

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as it happens, the amsfonts blackboard bold was based on times, not on computer modern. so, using amsfonts (which most people rightly associate with computer modern, and the symbols definitely are the cm style), $\mathbb{I}$ will actually produce a times-styled letter.

it's not always the case, but when "variants" on the latin alphabet are involved (fraktur, script, etc.), the letters are usually positioned in the "normal" ascii locations, so it's worth trying that first (if you know what font you want/need) before creating a chart to check the actual position.

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See page 11 of mathmode. Normally the font package writer will provide relevant commands. For example with amsfonts you will have.

\[\mathfrak{T} t_2 \]

\[\mathbf{Z}\]

\[\mathbb{Z}\]
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  • I'm sorry, I didn't quite understood your answer ( or the other one). How can the above display the $\mathbb{I}$ symbol from txfonts ? I actually use LyX and didn't inlcude any special package so I just assumed it was computer modern. The "[\mathbf{Z}] " command also won't work.
    – l7ll7
    Commented Mar 24, 2012 at 16:14
  • @user10324 You need to \usepackage{amsmath,amsfonts}. I am sure LyX has a way to include packages?
    – yannisl
    Commented Mar 24, 2012 at 16:19
  • Yes, it has those and I included them. But using your code still gives an error (I think a "\" was missing at the beginning of the second line). But even in that case \ [\mathbf{I}] doesn't give me the symbol I would get if I were to use $\mathbb{I}$ in a document where in the preamble I have \usepackage{txfonts}.
    – l7ll7
    Commented Mar 24, 2012 at 16:42
  • @user10324 Yes I missed the backslash, try using \[\mathbb{}\].
    – yannisl
    Commented Mar 24, 2012 at 16:47
  • No, '[\mathbb{I}]' with then amsmath,amsfonts package isn't looking like it is when using the txfonts package.
    – l7ll7
    Commented Mar 24, 2012 at 17:11

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