All Questions
6 questions
17
votes
23
answers
6k
views
Is there just one Zero?
Once i was discussing Zero with my kids, I picked up a pen and asked what it is they said 1 pen, then I kept the pen and showed them empty hand and asked how about now, they said Zero pen, then I ...
- 763
1
vote
1
answer
38
views
Is it consistent with beginning/ending principles for an interval-based temporal logic to cover a time that is exactly ω+ω intervals long?
The SEP article on temporal logic reports on possible beginning/ending principles for instant-based temporal logics:
beginning: ∃x¬∃y(y≺x)
end: ∃x¬∃y(x≺y)
Note that ≺ is the prior-to relation, here. ...
- 22.4k
-2
votes
4
answers
506
views
Why is the definition of the real numbers not contradictory? [closed]
I understand that a set whose members can, in principle, be enumerated (by having a formula) can be considered as a well-defined set. Therefore, set of all even numbers, multiples of 3, and so on ...
- 1,168
5
votes
1
answer
277
views
Square of Opposition with percentages?
What happens if you replace the statements of the Traditional Square of Opposition with "percentages of the subject term"? Do all the relationships from the Traditional Square of Opposition still ...
- 51
5
votes
2
answers
7k
views
Why is 2+2=4 a necessary truth?
A necessary truth is something which is true in all possible worlds. How can we be sure that there is no other universe where 2+2=4 can be untrue.
4
votes
4
answers
1k
views
What are the "undefinable numbers" in real analysis and philosophy?
What if any important results in real analysis make use of the notion of an "undefinable" real number? (Whatever "important" may mean to the reader.) Or is it used more in the philosophy of ...
- 1,408