12 Field theory and polynomials
12Dxx Real and complex fields
12D15 Fields related with sums of squares (formally real fields, Pythagorean fields, etc.) (4 articles)
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Chajda, Ivan; Länger, Helmut:
Orthogonality and complementation in the lattice of subspaces of a finite vector space.
(English).
Mathematica Bohemica,
vol. 147
(2022),
issue 2,
pp. 141-153
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Gładki, Paweł:
A note on the pp conjecture for sheaves of spaces of orderings.
(English).
Communications in Mathematics,
vol. 24
(2016),
issue 1,
pp. 1-5
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Skula, Ladislav:
A note on involutory automorphisms of $C$ and the use of algebraically independent numbers for the construction of diagonable matrices.
(English).
Acta Mathematica Universitatis Ostraviensis,
vol. 12
(2004),
issue 1,
pp. 49-60
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Novák, Břetislav:
O sedmnáctém Hilbertově problému.
(Czech) [Hilbert's seventeenth problem].
Pokroky matematiky, fyziky a astronomie,
vol. 20
(1975),
issue 3,
pp. 154-158