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References to 'Hessian matrix'
1. complex Hessian matrix by jirka
2. directional derivative by matte
3. Hessian and inflexion points by rspuzio
4. Hessian form by PrimeFan
5. inflection points and canonical forms of non-singular cubic curves by rspuzio
6. Levi flat by jirka
7. Morse function by bwebste
8. positive definite by matte
9. proof of arithmetic-geometric means inequality using Lagrange multipliers by stevecheng
10. relation between positive function and its gradient when its Hessian matrix is bounded by Andrea Ambrosio
11. relations between Hessian matrix and local extrema by bshanks
12. round function by juanman
13. tests for local extrema in Lagrange multiplier method by stevecheng