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Diffstat (limited to 'miralib/ex/ack.m')
| -rw-r--r-- | miralib/ex/ack.m | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/miralib/ex/ack.m b/miralib/ex/ack.m new file mode 100644 index 0000000..8a743eb --- /dev/null +++ b/miralib/ex/ack.m @@ -0,0 +1,9 @@ +||defines ackermann's function, beloved of recursion theorists. Example +|| ack 3 3 +||should yield 61, after doing a huge amount of recursion. Can only be +||called for small arguments, because the values get so big. + +ack 0 n = n+1 +ack (m+1) 0 = ack m 1 +ack (m+1) (n+1) = ack m (ack (m+1) n) +ack m n = error "ack applied to -ve or fractional arg" |