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It worked, thanks for the help

As requested

Sorry I said it worked, but had not tested the function definition, theorem, corollary and other works fine but setting gives an error like the image

Thank you, worked perfectly

Where it should be "Exemplo" which is the translation for the Portuguese sample is in English,ie example, so does Theorem, summary, definition

Hello, I am a user's recent lyx, and I'm loving it, and do not understand much English as I am Brazilian and Portuguese-BR use, I have the following problem.

I am doing a mathematics text and when you put a function for example - theorem, theorem appears in lyx, but when I generate the pdf file is ...