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Purpose: identify the next tablet for Plate 28 by surviving evidence gates, not by enthusiasm or analogy.

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Promotion rule

A tablet remains a lead until all four gates pass. Only then may it be promoted to Plate 28.

Gate 1 — Primary evidence

• High-quality photographs or hand copies available.
• Stable published transliteration or critical edition available.
• Museum or collection metadata available.

Gate 2 — Arithmetic closure

• Every printed numerical claim reconstructs from the source.
• Sexagesimal conversions are explicit.
• No hidden substitution is used to force agreement.

Gate 3 — Philological stability

• Critical signs are legible or independently published.
• No unresolved sign disagreement changes the mathematical interpretation.
• Literal reading and functional interpretation are separated.

Gate 4 — Historical leverage

• The tablet opens a branch not already covered by Plates 1–27.
• The plate can state one exact result and one bounded open question.
• The tablet supports a museum-quality visual narrative.

Status vocabulary