Does LR3 catalog roll automatically into LR4 on installation?

I installed LR4 and now have LR3 and LR4 catalog in the path: Mac HD>Users>me>pictures>Lightroom.  Do I need to keep the LR3 catalog. I'm not sure how to tell if it is redundant or not?
My question: Can I delete the LR3 Catalog? Is the LR3 catalog  automatically brought into LR4 upon installation? 
Thanks,
Rima

I would keep the Lr3 catalog for a while until you are sure that everything is OK in Lr4.
As long as Lr3 is not un-installed, you can use it to check things out as they were in the Lr3 catalog.
Lr3 cannot read the Lr4 catalog, so as long as you have the Lr3 catalog you can check things out in Lr3.
But refrain from doing any work in Lr3 because it would be saved in the Lr3 catalog while Lr4 works with the Lr4 catalog. So your Lr3 catalog should be "read only" - only for checking things.
Once you are sure that everything is fine and accounted for in Lr4 you can delete the Lr3 catalog and un-install Lr3.

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