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Codd's Theorem for Databases over Semirings [PDF]

open access: yesarXiv
Codd's Theorem, a fundamental result of database theory, asserts that relational algebra and relational calculus have the same expressive power on relational databases. We explore Codd's Theorem for databases over semirings and establish two different versions of this result for such databases: the first version involves the five basic operations of ...
arxiv  

Relative sea-level data from the SEAMIS database compared to ICE-5G model predictions of glacial isostatic adjustment

open access: yesData in Brief, 2019
The SEAMIS database (Mendeley data repository; https://doi.org/10.17632/wp4ctb4667.1) contains 546 relative sea-level indicators from 31 different studies within the broader Southeast Asian region including the Maldives, India and Sri Lanka.
Thomas Mann   +6 more
doaj  

Performance Characterization of Image Feature Detectors in Relation to the Scene Content Utilizing a Large Image Database

open access: green, 2017
Bruno Ferrarini   +4 more
openalex   +2 more sources

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