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References to 'positive element'
1. $L^2$-spaces are Hilbert spaces by asteroid
2. $\vert\langle Tv,v \rangle\vert \leq {\mu} \Vert v \Vert ^2$ for all $v$ implies $\Vert T \Vert \leq {\mu}$ by Gorkem
3. 2-C*-category by bci1
4. calculus of variations by rspuzio
5. canonical basis for symmetric bilinear forms by Mathprof
6. characterization of maximal ideals of the algebra of continuous functions on a compact set by rspuzio
7. closed ideals in $C^*$-algebras are self-adjoint by asteroid
8. compact quantum groupoids related to C*-algebras by bci1
9. decomposition of self-adjoint elements in positive and negative parts by asteroid
10. Dunkl-Williams inequality by Mathprof
11. equivalent norms by matte
12. extended norm by rspuzio
13. Fr\'echet derivative is unique by Mathprof
14. Gram determinant by CWoo
15. Hilbert module by mhale
16. Kato-Rellich theorem by Koro
17. lattice of projections by asteroid
18. normed vector space by rspuzio
19. ordering of self-adjoints by asteroid
20. polar decomposition by aube
21. positive linear functional by asteroid
22. primitive matrix by Mathprof
23. projections as noncommutative characteristic functions by asteroid
24. proof of quotients in $C^*$-algebras by asteroid
25. proof that the convex hull of $S$ is open if $S$ is open by archibal
26. properties of states by asteroid
27. Schur's condition for a matrix to be a bounded operator on $l^2$ by Gorkem
28. Schur's Test by karstenb
29. seminorm by rmilson
30. space of rapidly decreasing functions by matte
31. triple scalar product by slider142