From: milind.a.joshi@gmail.com   
      
   Hi,   
      
   Answers to these questions could very well be dependent on personal   
   preferences. My answers below are one view of the fields.   
      
   Known expert systems are generally large scale if-then-else systems,   
   and don't have much to do with machine learning.   
      
   Machine learning is where you show a program a set of examples of what   
   you want, and get it to learn the characteristics of those examples   
   without getting caught up in the specific details of any one example,   
   and hopefully, it can do a good job with unseen cases of your problem.   
      
   Generally, ML is studied as a part of AI, though many would argue ML is   
   AI! :-)   
      
   Also, AI doesn't really exist as a single discipline, but is a broad   
   collection of approaches to solving problems automatically without   
   hand-coding or creating machines that merely automate a set of rules.   
      
   Regards,   
   Milind   
      
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