If you would like to be alerted about new library materials in your area of interest, you can sign in to InfoKat Discovery and set this up. After you run a search for your topic (like subject: "group theory") and do any refinements (like restricting to peer-reviewed articles) you can save that search using the Save query link on the left side of the search results page.
While saving the query, you can choose to have any new materials matching that search automatically emailed to you. You can also create an RSS feed of those new search results, and subscribe to it using a feed reader like Feedly or NewsBlur.
If you're taking a class with course reserves in InfoKat Discovery, you can search for your course code from the Course Reserves tab, and save that search with an alert; that way, you'll always be informed when your professor puts new materials for your course on reserve!
You can manage your saved queries through the Queries tab of the My Account page. From that tab, you can see queries you have saved, change how you are notified about new materials, or delete saved queries when you no longer want to receive their results. InfoKat Discovery also keeps track of searches you have done this session, so you can re-visit any of those searches from this page as well.