Non-Commutative Pre-Schoolers

Socks before shoes is a useful analogy for order-dependent operations. It does not explain quantum uncertainty, and infant sequence memory is not evidence of group-theoretic understanding. The shared structure is narrower: changing operation order can change, or prevent, the result.

13 November 2023 · 5 min · Sebastian Spicker

The Charm of Impossibilities: Group Theory and Messiaen's Modes of Limited Transposition

Messiaen’s seven modes of limited transposition cannot be fully transposed through all twelve keys — not by convention, but because of group theory. The modes are pitch-class sets whose stabiliser subgroups in ℤ₁₂ are non-trivial. The orbit–stabiliser theorem gives the exact count of distinct transpositions for each mode. The subgroup lattice constrains the possible symmetry types; it does not select Messiaen’s seven scales.

19 April 2023 · 11 min · Sebastian Spicker