I would like to insert the less than or equal mathematical operator in the text of a Lyx document.
Insert/Special Character/Symbols shows the symbol in the text, but compiling results in an error ("Missing character: There is no <= font Dolly-Roman/OT:mapping=tex-text;mappin").
Inserting an ERT box with $\leqq$ gives an "Undefined control sequence" error.
How do I insert the <= (\leqq) symbol in my text if the font that I am using does not have it?