Equation 677 Database

Magma 7505447f731c…

magma 7505447f731c
Size
101
Isomorphism class hash
7505447f731ceccf9c409d4667dfcec484e9a63e74f93f2642f8bd62fca8f189
Satisfies Equation 255
yes
Right-cancellative
yes
Idempotent
yes
Submitted by
b-reinke
Submitted at
2026-05-13 08:22:22
Display reorder
0,1,32,52,59,40,51,75,57,95,69,76,28,86,49,71,8,50,23,47,17,35,22,29,62,37,30,54,79,78,60,46,12,72,87,19,31,26,42,27,91,80,6,14,18,21,94,39,15,82,70,20,11,36,65,67,3,33,56,5,77,7,66,63,88,100,10,41,44,85,24,83,34,55,81,45,43,58,89,98,48,4,93,61,16,99,96,92,84,2,13,74,64,73,53,97,9,25,90,68,38 history
Raw table
canonical order · displayed order
Equational Theories
Finite Magma Explorer

Commentary

Size-101 idempotent right-cancellative translation-invariant magma on F_101 (= Z/101 additively). Operation x ◇ y = x + δ(y - x) where δ : F_101 → F_101 is a permutation with δ(0) = 0 and cycle structure (10^10, 1) on F_101* — 10 orbits of size 10, fixed point at 0. Decomposition: with respect to the order-10 subgroup H ⊂ F_101* ({1, 6, 14, 17, 36, 65, 84, 87, 95, 100}), F_101* has 10 cosets. δ acts as: • multiplication by α₀ = 65 on cosets {0, 2, 4, 6, 8} (5 even-index cosets) • multiplication by α₁ = 14 on cosets {1, 3, 5, 7, 9} (5 odd-index cosets) where coset indices are with respect to the F_101* generator g = 2. Both α₀ = 65 and α₁ = 14 are primitive 10th roots of unity in F_101* (= roots of Φ_10(x) = x⁴ - x³ + x² - x + 1 mod 101), namely from the 4-element set {6, 14, 17, 65}. Because these ratios lie IN H, multiplication by them keeps each element in its coset, giving the 10 separate cycles of length 10. eq677 follows from the per-coset identity α⁴ - α³ + α² - α + 1 ≡ 0 mod 101. The magma is globally NOT medial (since α₀ ≠ α₁). Display reorder: relabel points so that the magma's order-101 translation auto acts as i ↦ i + 1, making T[i+1][j+1] ≡ T[i][j] + 1 (mod 101) directly visible. Compare ee5b34c8 (the one size-101 b-reinke outlier): same template but with α₀, α₁ taken from primitive ROOTS of F_101* (order 100), not 10th roots. [text written by Claude]

last edited by dwrensha at 2026-05-13 19:15:29 · history