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October 16th, 2013, 09:09 PM  #1 
Member Joined: Sep 2013 Posts: 43 Thanks: 0  MthLogic  Can u help me find out where I made the mistakes?
I'm really trying to understand these things... Consider the domain D = fall CSC courses and all MAT courses, and the predicate symbols C(x): "x is a CSC course", M(x): "x is a MAT course", and P(x; y): "course x is a prerequisite for course y". Using only these symbols (in addition to appropriate connectives and quantiers), give a clear symbolic statement that corresponds to each given English sentence. Quantiers may only be over the domain D. Part (a) CSC108 is a prerequisite for CSC148. ? x ? D, ? y ? D, C(x) ? C(y) ? P(x; y) Part (b) There is no prerequisite for CSC104. ? x ? D, ? y ? D, C(y) ? 星(x; y) Part (c) Every course has a prerequisite. ? x ? D, ? y ? D, P(x; y) Part (d) No course is a prerequisite for itself. ? x ? D, 星(x; x) Part (e) Some CSC course has a prerequisite. ? x ? D, ? y ? D, C(y) ? P(x; y) Part (f) Every MAT course has a prerequisite. ? x ? D, ? y ? D, M(y) ? P(x; y) Could you tell me where I made the mistakes? And how would they look if they were expressed correctly? 
October 17th, 2013, 12:35 AM  #2  
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: MthLogic  Can u help me find out where I made the mista Quote:
Quote:
? x ? D, ? y ? D, C(x) ? 星(y; x) Quote:
? y ? D, ? x ? D, P(x; y) Quote:
Quote:
? y ? D, ? x ? D, C(y) ? P(x; y) Quote:
? y ? D, ? x ? D, M(y) ? P(x; y)  

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