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Nov
17
awarded  Yearling
Nov
17
awarded  Nice Answer
Feb
19
awarded  Yearling
Dec
16
comment Check Whether A Boolean Formula Has One Satisfying Assignment
"because you can easily verify a "no" answer given a certificate containing two satisfying assignments" - what if the formula has no satisfying assignments? I'm pretty sure that exactly-1-SAT is in $\Sigma_2^p\cap\Pi_2^p$, but not known to be lower.
Nov
7
comment How To Reach The “Next Level” of Mathematics
Also, upon second reading, I think you may have mistaken my purpose. I agree with you on every point. I meant the link to be supporting evidence.
Nov
7
comment How To Reach The “Next Level” of Mathematics
That is why I included the link. I know I sometimes get muddled up about what I learned when, so I gave most in this thread the benefit of the doubt and just wanted to post a reminder.
Nov
3
comment How To Reach The “Next Level” of Mathematics
For future posters, here is a sample of topics covered in your typical middle school math curriculum: edhelper.com/math/math_grade8_review_4.htm
Oct
24
awarded  Nice Answer
Oct
24
comment What is the ordinal number for the set of binary strings ordered lexicographically?
I mix this up all the time as well, so I did a little digging and it looks like you (Marian) are right. I edited my answer accordingly.
Oct
24
revised What is the ordinal number for the set of binary strings ordered lexicographically?
added 218 characters in body
Sep
14
revised Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
added 8 characters in body
Sep
14
awarded  Commentator
Sep
14
comment Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
@Carl: You are correct. That is what I meant. Edited.
Sep
14
comment Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
@Carl, That's why I restricted to $[0,1]$. Now 1 is always in the first set and 0 is always in the second.
Sep
14
awarded  Editor
Sep
14
comment Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
The answer should now be fixed to make it clear that you could use either ordering.
Sep
14
revised Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
added 10 characters in body; added 7 characters in body
Sep
14
comment Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
No, they refer to the standard ordering of the reals.
Sep
14
comment Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?
Sorry, x and y are taken to be real numbers in [0,1].
Sep
14
answered Given an infinite poset of a certain cardinality, does it contains always a chain or antichain of the same cardinality?