# How to get All Math Numbers in Italics?

I am currently trying to get all numbers in math mode in italics. However, I find no way of re-defining the numbers 0,1,2,3,4,5,6,7,8,9 to make them italics as long as they are in a math environment. I am using the Fourier font, both for text and math. Though it's not quite useful, here is a small MWE.

\documentclass{article}
\usepackage[sloped]{fourier} % To customise font.
\begin{document}
$0123456789$
\end{document}


The numbers in the output (below) are of course not in italics, which is what I wish.

Any help will be appreciated.

PS: I am aware that this may be considered bad typesetting practices, but I want to see how it looks in my document anyway.

PS2: I found several closely-related questions in the site; but none of them addressed this question in particular. If this is already answered in the site; I am sorry: I never saw it in my search.

normally you would have been able to allocate digits to the letter alphabet but that doesn't seem to give italic digits in this setup, so I allocated a new math alphabet.

\documentclass{article}
\usepackage[sloped]{fourier} % To customise font.
\DeclareSymbolFont{mathit}{T1}{fut\mathfamilyextension}{m}{it}%

\DeclareMathSymbol{0}{\mathord}{mathit}{0}
\DeclareMathSymbol{1}{\mathord}{mathit}{1}
\DeclareMathSymbol{2}{\mathord}{mathit}{2}
\DeclareMathSymbol{3}{\mathord}{mathit}{3}
\DeclareMathSymbol{4}{\mathord}{mathit}{4}
\DeclareMathSymbol{5}{\mathord}{mathit}{5}
\DeclareMathSymbol{6}{\mathord}{mathit}{6}
\DeclareMathSymbol{7}{\mathord}{mathit}{7}
\DeclareMathSymbol{8}{\mathord}{mathit}{8}
\DeclareMathSymbol{9}{\mathord}{mathit}{9}
\begin{document}
$0123456789$
\end{document}

• Wouldn't it be better \mathalpha? Also \DeclareSymbolFontAlphabet is needed. Mar 26 '17 at 13:00
• @egreg well \mathalpha or \mathord depends on the definition of "All" in the question. Not sure about \DeclareSymbolFontAlphabet? that's for making a \mathxxx alphabet command out of a symbol font but this needs the other way I've declared a symbol font, oh you mean redeclare \mathit to use this and save a fam? I suppose so... Mar 26 '17 at 13:05
• @Héctor as it is the digits will always be in that font even if you use \mathrm{1} etc if it was \mathalpha instead then they would start in that font but obey font change commands Mar 26 '17 at 13:40
• @Héctor yes.... Mar 26 '17 at 13:45
• @Héctor not easily (anything is possible of course, you could make them active and look ahead for ) but the more tricky macros you add the more things will break) Mar 30 '17 at 10:02