The symbol equivalent to tex command \nrightarrow is not compiling.

[Akhilesh Singh]

At present I am using  LyX-2.3.7 for writing a book for Statistics, wherein
I need to use the math symbol equivalent to tex command \nrightarrow. For
example, I need to state the negative form of x -> o. In the display screen
of LyX the required symbol appears correctly, but during pdf compilation
(all forms provided into LyX), does not convert the symbol, and nothing is
printed in the pdf.

It rather gives a warning in the log file that this symbol was never
defined. When I used the tex command as ERT of \nrightarrow, then also it
showed the same error.

Can anybody give any idea to resolve this?.

Thanks in anticipation.

Dr. A.K. Singh
Raipur, India
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