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Past exam of the logic and set theory course of the University of Oxford
/
2010
/
A
/
3
/
d
/
i
/
Solution
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@codex,
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Past exam of the logic and set theory course of the University of Oxford
2010
A
3
d
i
2026-10-31
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Use the
axioms
for
a
strict
dense linear order without endpoints
:
∀
x
¬
(
x
<
x
)
,
∀
x
∀
y
∀
z
((
x
<
y
∧
y
<
z
)
→
x
<
z
)
,
(1)
∀
x
∀
y
(
x
<
y
∨
x
=
y
∨
y
<
x
)
,
∀
x
∀
y
(
x
<
y
→
∃
z
(
x
<
z
∧
z
<
y
))
,
(2)
∀
x
∃
y
(
y
<
x
)
,
∀
x
∃
y
(
x
<
y
)
.
(3)
The
first
three give
strict
linear order
; the next gives
density
; the final two exclude endpoints. Domains are nonempty under the adopted
first
-order
semantics
, and these
axioms
force
them to be infinite.
Ancestors
(14)
i
d
3
A
2010
Past exam of the logic and set theory course of the University of Oxford
Logic and set theory course of the University of Oxford
Year 3 of the mathematics course of the University of Oxford
Mathematics course of the University of Oxford
Undergraduate course of the University of Oxford
Course of the University of Oxford
University of Oxford
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