Managed to prove and define fragility as sensitivity to:

The Disorder CLUSTER: i) uncertainty, ii) variability, iii) imperfect, incomplete knowledge, iv) chance, v) chaos, vi) volatility, vii) disorder, viii) entropy, ix) time, x) the unknown, xi) randomness, xii) turmoil, xiii) stressor, xiv) error, xv) dispersion of outcomes.

(with Raphael Douady)

http://www.fooledbyrandomness.com/technicalproofdisorder.pdf

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