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# Argument selection
These are intrinsic extremal heights, with the finite origin limit where it exists. The exact argument is the unique zero of the derivative in the explicitly listed rational interval. The intervals identify roots; their endpoints are not evaluation arguments. Six isolated critical arguments are retained per selected order. Numbering orders this finite selection, without claiming a global count of all preceding zeros. The order-zero Kelvin functions are the standard ber, bei, ker, kei functions.
## Limitations
No external application is asserted for these individual extremal heights; their relevance is intrinsic.
## Primary references
- https://dlmf.nist.gov/10.61
- https://dlmf.nist.gov/10.63
The certified argument definitions are in `selection.json`. Run `python generate.py` to verify; run `python checks.py T493` for the independent checks. Neither command writes. Earlier attachments describe historical grids and remain available for provenance.