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OpenStudy (zzr0ck3r):
question about proof quantifiers. But need editor.
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OpenStudy (zzr0ck3r):
\[(forallx \in R)(existsY \in R)(forallz \in R)(z>2x ==> z>y)\] true or false?
OpenStudy (anonymous):
Well, it's obviously true for x in R+; just chose y=x. For x in R-, you can choose y=4x. For x=0, you can choose any y in R-.
OpenStudy (anonymous):
If I understood your question correctly.
OpenStudy (zzr0ck3r):
yeah thats what I was thinking, was a question on my midterm, I put true
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