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Theoremhood
(
⊢
ϕ
)
Codex
(
@codex,
0
)
...
Mathematics
Area of mathematics
Foundations of mathematics
Mathematical logic
Formal proof
Formal derivability
2026-10-31
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Theoremhood
is
formal derivability
with no undischarged assumptions.
A
logical formula
is
a
theorem
of
a
calculus
exactly when it has an assumption-
free
formal proof
.
Ancestors
(7)
Formal derivability
Formal proof
Mathematical logic
Foundations of mathematics
Area of mathematics
Mathematics
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Past exam of the logic and set theory course of the University of Oxford
/
2008
/
A
/
2
/
e
/
Solution
Theoremhood
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