>> >>Thanks so much for the prompt reply. But I was unable to add it (Theorems >>(AMS, > >>Numbered by Type).) from left column to the right side to apply it. It seems >>that it is not available. >> >>
You need to remove the "Theorems (AMS)" (or "Theorems") module before you can add the "Theorems (AMS, Numbered by Type)" one. Note that numbering all theorems/lemmas/etc together is not a "problem", just a matter of taste. (I certainly prefer it... it's annoying hunting for Lemma 15, when all you know is that this page has Theorem 12 and Definition 18. Which way do I look?)