I am doing a projet for my Bachelor in Mathematics course. However, I am stuck on how to cite the following paper in my Latex code:

The BiB file of the paper is given as follows:

  title={Laplacian spectrum of comaximal graph of the ring ℤn},
  author={Banerjee, Subarsha},
  journal={Special Matrices},
  publisher={De Gruyter Open Access}

I have the following code which consists of a TeX file and also my References file iin the same folder. However, when I am compiling the following code

\usepackage[style=numeric, sorting=ydnt]{biblatex}
    In  \cite{banerjee2022laplacian}, the authors have shown that 

I am getting the below error.

Package inputenc Error: Unicode character ℤ (U+2124)(inputenc) not set up for use with LaTeX. \end

Can someone please help me how to get rid of it? This is my first project in my BSc. course, so I am not aware how to fix these type of errors. I am looking forward from all the learned people out here for some help.

  • 3
    you could declare ℤ to work but it would be more normal to use tex markup in the bib file so $\mathbb{Z}_n$ not ℤn Mar 27, 2022 at 14:59
  • I used $\mathbb{Z}_n$ but I am not getting the desired output, can you pls give an alternative way and show it in an example by giving an answer, Sir
    – Olivia
    Mar 27, 2022 at 15:17
  • tha should work, you may need to delete your exising generated bbl file. Mar 27, 2022 at 15:22
  • 1
    @DavidCarlisle; wow, deleting the bbl file worked, you are truly a genius, lots of love to you.
    – Olivia
    Mar 27, 2022 at 15:27

1 Answer 1


Use math markup in the bib file:

  title={Laplacian spectrum of comaximal graph of the ring $\mathbb{Z}_n$},

Then delete your existing genrated .bbl file and re-run pdflatex, biber, pdflatex and get the output

enter image description here

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