Why sometimes the command \mathcal{} give different output? Or under what conditions? Like any dependence on the document type...

Initially when I was writing my thesis, throughout the writing procedure, \mathcal{} command works well and gave the output as follows:

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But now, today, I compile my file, and all the alphabets that I wrote in the \mathcal{} environment, changes. and the output is as follows:

enter image description here

Note: I didn't change any command although I changed the document type many times from book to article etc and now it is report. But initially, the fonts weren't affected by this change. It's happening only today.

Please give me a solution as I can't change the word by word alphabet throughout my thesis because its a 100 page file and time is too short.

  • Can you include a list of the packages you are using? – Calvin Khor Jun 11 at 6:07
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    book and article use the same fonts but you must have changed the math fonts at some point. The standard \mathcal only works with uppercase letters you appear to imply you also use it with abc ? – David Carlisle Jun 11 at 8:41
  • No, I only used it with upper case... Initial it works well for all the thesis... But today's morning it changed.... That's why i was wandering – Badshah Khan Jun 11 at 9:14
  • If you want help you need to give us some clues as to what the problem is. Why do you show \mathcal: abc.... if you don't expect that to work, and obviously if the output changed it did not change because it was "this morning" you have changed the input somewhere. – David Carlisle Jun 11 at 14:04
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    I’m voting to close this question because there's not enough detail to answer the question. – Werner Jun 14 at 4:45

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