Geodesic
On binary coproducts of frames
Commentationes Mathematicae Universitatis Carolinae, Tome 33 (1992) no. 4, pp. 699-712.

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The structure of binary coproducts in the category of frames is analyzed, and the results are then applied widely in the study of compactness, local compactness (continuous frames), separatedness, pushouts and closed frame homomorphisms.
Classification : 06A15, 06A23, 18A20, 18A30, 54C10, 54D10, 54D30, 54D45
Keywords: frame; binary coproduct; pushout; compactness; separatedness; continuous frame; closed homomorphism; $D(\kappa)$-frame 
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     author = {Chen, Xiangdong},
     title = {On binary coproducts of frames},
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     zbl = {0824.54004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1992__33_4_a15/}
}
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Chen, Xiangdong. On binary coproducts of frames. Commentationes Mathematicae Universitatis Carolinae, Tome 33 (1992) no. 4, pp. 699-712. http://geodesic.mathdoc.fr/item/CMUC_1992__33_4_a15/