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References to 'non-zero vector'
1. $\Psi$ is surjective if and only if $\Psi^\ast$ is injective by matte
2. affine combination by CWoo
3. affine geometry by CWoo
4. degree (map of spheres) by drini
5. derivation of Sylvester's matrix for the resultant by rspuzio
6. direction cosines by pahio
7. generalized eigenvector by CWoo
8. hyperbolic plane in quadratic spaces by CWoo
9. inner product space by CWoo
10. isotropic quadratic space by CWoo
11. Levy-Desplanques theorem by Andrea Ambrosio
12. mutual positions of vectors by pahio
13. negative definite by drini
14. negative semidefinite by drini
15. positive definite by matte
16. positive semidefinite by drini
17. unit vector by rmilson
18. vector projection by pahio
19. Verma module by owenjonesuk
20. zero matrix by waj