FA-63352 / Actuarial life tables / Member archive

Life table survivors from mortality rates: Tables with a later non-terminal rate are accepted as closed · case 02

An open table produces survivors past the last age.

Member previewVariant 2 · 3 implementations · 12 checks per implementation

Case contract

Input q (per 100000, last must be 100000 else 'open table'; any outside [0,100000] -> 'invalid q') and radix (<=0 -> 'invalid radix'). l_0 = radix; l_{k+1} = l_k*(1-q_k) rounded half-up at every age; d_k = l_k - l_{k+1}. Return [l, d].

Why this case matters

Life-table arithmetic compounds across ages, so one misplaced index or assumption shifts every downstream value.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
open table rejected	`[[10000, 9960, 9911, 9851, 9785, 9711], [40, 49, 60, 66, 74]]`	`"open table"`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.