Definition Tag in Article style

[Victor Anaya]

Hi,

I am using Article as document style, but I want to define some paragraphs 
of my document such as definition (\begin{definition}). The problem is that 
Article.cls does not have this tag defined. How can I do it? I do not want 
to use the document style that has this tag (llcs.cls) as document style 
because it is usuitable for the rest of document.

Thanks in advance,

Victor

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