Mathematical Logic and Structures

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The discussion revolves around urgent requests for solutions to mathematical logic and structures problems crucial for completing a degree. Key topics include converting formulas into prenex form, expressing uniqueness in predicate logic, and verifying tautologies. Additionally, participants seek assistance in identifying subgroups generated by specific sets and describing free objects in partially ordered sets. The urgency stems from the potential impact on the poster's academic progression. Immediate help is requested to avoid delaying graduation.
rafa_mota04
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URGENT ! Mathematical Logic and Structures

Hey guys, i need a HUGE favor, i need the resolution for this 5 questions, its a question of end this year my degree or stay one year just with a subject. Please I am begging, who knows the resolution please say me something.



Part 1: Mathematical Logic
2- Convert the formula into the prenex form: (square root of)x p(x,g) -> ( inverted E )y (square root of) z q (x,y)
3- Consider the language L with the symbol of equality and one array predicate symbol. Write the formula in this language which express “there exist exactly one x such that p(x) holds”
4- Verify, which any of the formulas ¬ A v B and ( A or B ) substituted for x makes the formula ( A -> x ) -> ( x -> B ) a tautology.
Part 2: Mathematical Structures
1 - find the subgroup of the group (Z, +, 0) generated by the set {20,25} .
2 - Describe the free object over a given set X on the constant Pos (of partially ordened sets and isotone maps)
 
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I picked up this problem from the Schaum's series book titled "College Mathematics" by Ayres/Schmidt. It is a solved problem in the book. But what surprised me was that the solution to this problem was given in one line without any explanation. I could, therefore, not understand how the given one-line solution was reached. The one-line solution in the book says: The equation is ##x \cos{\omega} +y \sin{\omega} - 5 = 0##, ##\omega## being the parameter. From my side, the only thing I could...
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