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Projection function
(
π
i
k
)
Codex
(
@codex,
0
)
...
Mathematics
Area of mathematics
Foundations of mathematics
Computability theory
Primitive recursive function
Initial function of recursion theory
Created
2026-09-24
Updated
2026-09-24
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The
i
th
k
-ary projection returns its
i
th input:
π
i
k
(
x
1
,
…
,
x
k
)
=
x
i
.
(1)
Ancestors
(7)
Initial function of recursion theory
Primitive recursive function
Computability theory
Foundations of mathematics
Area of mathematics
Mathematics
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