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References to 'directional derivative'
1. coboundary definition of exterior derivative by rmilson
2. connection by rspuzio
3. derivative notation by mathcam
4. differential form by rmilson
5. differential geometry by rspuzio
6. gradient by CWoo
7. Jacobian matrix by PhysBrain
8. Lagrange multipliers on manifolds by stevecheng
9. proof of chain rule (several variables) by paolini
10. Taylor's formula in Banach spaces by stevecheng