A mapping \( \phi \) is monotone if for all \( x,y \in \text{dom}\phi\),
\[(x-y)^T(\phi(x)-\phi(y))\geq0\]
Reference:
- Boyd, S. P., & Vandenberghe, L. (2004). Convex optimization. Cambridge university press.
- Khanh, P., Luong, H. C., Mordukhovich, B., & Tran, D. (2024). Fundamental convergence analysis of sharpness-aware minimization. Advances in Neural Information Processing Systems, 37, 13149-13182.
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