Riemann's 1859 'monster' R(t) = sum_{n>=1} sin(pi n^2 t)/(pi n^2). Continuous everywhere, differentiable only at rationals (2p+1)/(2q+1) where R' = -1/2 (Gerver 1970), nowhere else (Hardy 1916). Quadratic frequencies n^2 with 1/n^2 amplitude decay --- the steepest known cosine fractal: ~92% of energy in the fundamental, non-differentiability emerging from the long thin Hausdorff-dimensional tail.
Standard analysis sees: smooth / autocorrelated; long-range memory (persistent); strongly periodic; volatility-clustering (bursty); low-dimensional; nonstationary / drifting. The atlas additionally detects Multi-Scale Wasserstein:w_max_ratio, Nonstationarity:adf_pvalue, Multifractal Spectrum:hurst_estimate.
Septagonal (Danzer):z_primary | +3.2z | bank-miss 1.1σ |









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| Nearest neighbor | Distance | |
|---|---|---|
| fBm (Persistent) | 3.64 | cross-origin |
| Perlin Noise | 4.00 | cross-origin |
| Geometric Brownian Motion | 4.03 | cross-origin |
Ammann-Beenker (Octagonal) › Ammann-Beenker (Octagonal):convergent_profile | rank 305/307 | -0.1570 |
Catch24 › Catch24:CO_HistogramAMI_even_2_5 | rank 1/307 | 1.5593 |
Catch24 › Catch24:SC_FluctAnal_2_dfa_50_1_2_logi_prop_r1 | rank 1/307 | 0.8720 |
Catch24 › Catch24:SP_Summaries_welch_rect_area_5_1 | rank 3/307 | 0.9999 |
Catch24 › Catch24:FC_LocalSimple_mean3_stderr | rank 305/307 | 0.0089 |
Chladni › Chladni:plate_low_mode_fraction | rank 3/307 | 0.9955 |
H² × ℝ (Thurston) › H² × ℝ (Thurston):radial_temporal_memory | rank 4/307 | 4.9648 |
Multi-Scale Wasserstein › Multi-Scale Wasserstein:w_max_ratio | rank 2/307 | 2884.9213 |
Navier-Stokes › Navier-Stokes:sl_fit_quality | rank 1/307 | 0.9579 |
Navier-Stokes › Navier-Stokes:ess_rescaling_gain | rank 303/307 | 0.0001 |
Predictability › Predictability:excess_predictability | rank 2/307 | 2.9204 |
SL(2,ℝ) (Thurston) › SL(2,ℝ) (Thurston):trace_autocorrelation | rank 4/307 | 0.9992 |
Septagonal (Danzer) › Septagonal (Danzer):cubic_coherence | rank 3/307 | 0.2564 |
Septagonal (Danzer) › Septagonal (Danzer):z_primary | rank 3/307 | 0.3143 |
Spectral Analysis › Spectral Analysis:spectral_bandwidth | rank 304/307 | 0.0009 |
Spherical S² › Spherical S²:hemisphere_balance | rank 3/307 | 0.9999 |