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Devil's Staircase - mklabgr - 07-28-2026
Devil's Staircase
Summary
The Devil’s Staircase is a self-similar, monotonic fractal function—most famously illustrated by the Cantor function and mode-locking behavior in circle maps—that continuously maps the interval $[0,1]$ onto $[0,1]$ while remaining constant almost everywhere except on a set of measure zero (such as a Cantor set). In nonlinear dynamics, it models systems whose winding numbers lock into rational values at each step, forming a staircase where simpler rational steps occupy larger intervals.
MathWorld also notes a related arithmetic variation defined via infinite sums of floor functions, which yields a function that is continuous at irrational inputs and discontinuous at rational ones, highlighting deep connections between non-differentiable fractal curves, chaos theory, and number theory.
ARTICLE