LaTeX doesn't show negative sign in exponent

Question

Writing the code

The weight decay was set to $1 times {10^{−4}}$ for Model 8 and $5times 10^{−4}$.

the negative sign is missing.

And these are the packages I'm using

usepackage{jmlr2e}
usepackage{indentfirst}
% Definitions of handy macros can go here
usepackage{float}
usepackage{underscore}
restylefloat{table}
newcommand{dataset}{{cal D}}
newcommand{fracpartial}[2]{frac{partial #1}{partial  #2}}

Cragfelt · Accepted Answer

The problem occurs because the symbol − that's used in both exponents is not a "normal" dash symbol, -. Instead, it is the Unicode symbol U+2212, the "math minus" symbol. (Did you maybe copy and paste the input from some other source?)

Here are three remedies:

Switch to either XeLaTeX or LuaLaTeX and load either the fontspec package or the unicode-math package (which loads fontspec automatically).
If you need to use pdfLaTeX, add the following instructions to your preamble:

usepackage[utf8]{inputenc}
DeclareUnicodeCharacter{2212}{-}

Finally, consider simply replacing all instances of − with -. (That's what's done in the code below.)

documentclass{article}

begin{document}

section*{Your code}
The weight decay was set to $1 times {10^{−4}}$ for Model 8 and $5 
times 10^{−4}$.

bigskip

section*{Correct code}
The weight decay was set to $1 times {10^{-4}}$ for Model 8 and $5 
times 10^{-4}$.

end{document}

M. Logic · Answer

I fixed your codes as follows:

The weight decay was set to $1 times {10^{-4}}$ for Model 8 and $5times 10^{-4}$.

And the following is the PDF style.

The reason that why your − can't be complied may be that you type it not in English typewriting. Please make sure you are under English typewriting when you type codes in math environment.

Zarko · Answer

shorter and correct with use siunitx package:

documentclass{article}
usepackage{siunitx}

begin{document}
The weight decay was set to num{1e-4} for Model 8 and num{5e-4}.
end{document}

LaTeX doesn't show negative sign in exponent

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