Archetype Sub-90 Dry-Wipe Invariant (Sigma Notation (Fence-Post n-m+1 Terms) & Periodic Recurrence Relations (uₙ₊₁ = f(uₙ))): For recurrence relations uₙ₊₁ = f(uₙ) asking for u₁₀₀ or sumₙ₌₁¹⁰⁰, compute u₁, u₂, u₃, u₄ first—90% of ESAT/TMUA recurrences are periodic with period 2, 3, 4, or 6. In sumᵣ₌ₘⁿ, count = n - m + 1.
sub90 ESATARCH-MM-04: Sigma Notation (Fence-Post n-m+1 Terms) & Periodic Recurrence Relations (uₙ₊₁ = f(uₙ))Mathematics 2
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SUB-90 ZONE (<45S)
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