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math_proofBest ResponseYou've already chosen the best response.1
suppose that "if z is a wgroup then z is solvable" is a true statement, you also know that the "z is solvable" is true. can you deduce that "z is a wgroup" is true?
 one year ago

omgitsjcBest ResponseYou've already chosen the best response.0
i wish i was good a math
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
no because for the statement to be true z is a wgroup could be true or false
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.0
unless there's more to that question...don't you just put a "not" before the adjective?
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
igbasallote what are you talking about?
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
in a "if p then q" statement. if "if p" is false the whole statement is true regardless of then p. If they are both true then it is also true. It can only be false if "if p" is true and "then q" is flase.
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
I can give you an example to clarify if you want
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
I was answering ur second question by the way
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
@lgbasollote was answering your first.
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
and @lgbasallote you were correct
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
I don't get what lgbasallote was saying
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
actually let me look at me logic notes to make sure.
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
The correct answer to your first question is All cabages are not green
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
Like the car is red. The negation is the car is not red
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
why isn't it not all cabbages are green
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
because that implies that some are green
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
we want to to do a complete opposite
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
so u wan't to tell that none of them are green right?
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
Did you understand what I was saying to your second question
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
im trying to figure it out now
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
What class is this? just curious
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
advanced mathematics
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
whole class based on proofs basically
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
induction proofing, contradictions, and now we are at sets theories
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
I took a class called mathematical logic which involved a bunch of this stuff. Kinda interesting kinda hell
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
Only class I have ever had to drop cuz i was failing. Sets, relations, and functions.
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
Let me know if you don't understand my explanation about your second question I can provide an example that would make it clearer. I'm going to move on to other questions
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
thats pretty much what i am in now, and let me tell you that I have no idea how im going to pass that class
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
Logic was kinda fun. Sets is hell. I would master definitions. completely understand what a subset is and what real numbers and complex numbers. just master definitions because you can use those in ur proofs. I wish I had done that.
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
im trying to figure out that example and don't completely get it So P=>Q so if z is a wgroup then z is solvable IS TRUE, then "Z is solvable is also true" why s s "Z is a wgroup false?
 one year ago

DanielxAKBest ResponseYou've already chosen the best response.0
The negation of "all cabbages are green" is "there exists a cabbage which is not green". All is a quantifier.
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
isn't the negation "all cabbages are not green?"
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
So @DanielxAK we just had to show that for all to be false one is true?
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
lets use p and q for your question all the words are confusing me lol. So the question is essentially... If, if p then q is true, then q is true" So its a nested statement?
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
P>Q T Premise Q T Prove
 one year ago

DanielxAKBest ResponseYou've already chosen the best response.0
I'm not sure I understand what you mean by that. If it was phrased, cabbage is green. Then, the negation would be cabbage is not green. But, you have "all cabbages are green". So, the negation would be "there exists a cabbage which isn't green". The negation of all is one. This might be able to explain it better than I can: http://www.math.cornell.edu/~hubbard/negation.pdf
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
Your second question @math_proof, I think it is a correct statement. Because "if p" is true, for the statement to be true (which it is by a premise) "then q" must be true. and "if p" is false. Then "then q" is assumed true because it can't be proven otherwise.
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
You got me inerested now. I dug out my logic notes. Law of Equivalence for Implication and Disjunction (LEID) states IF p>q is true, THEN not p or q is true
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
So we are Given that P > Q is true correct? and we have to prove that Q is true? am I understanding right?
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
we know that Q is true
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
so P can be either true of false
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
so P=>Q, z is a wgroup then z is solvable" is a true statement, so P>Q is true and we know Q is true because "Z is solvable" so P can be either True of False? thats what i'm thinking
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
P>Q T Premise Q T Premise P T Prove Ok I'm on the right page
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
So I would say the answer is ~P V P
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
thats based on truth table on logical implication
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
so we can't deduce if P is true
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
I have this cheat sheet that my teacher made us with all the laws of logic that can be used in a proof. If you'd like it i'll email it to you. Just private message me your email. If you are not comfortable with that I guess I could post it on this thread, but I've got warned for stuff like that
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
I guess we can't for certain
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
omg thanks so much for that, I actually get it now
 one year ago

ChmEBest ResponseYou've already chosen the best response.1
No problem. When you jump into sets I will be no help. Like I said earlier for sets proofs I would master definitions because my teacher used a lot of "By def'n..." in her proofs
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
i never heard of this website, but now that i discovered it is so useful and helpful and for free
 one year ago

math_proofBest ResponseYou've already chosen the best response.1
how do you give a medal?
 one year ago
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