The disjunction property of Wallman is named after Wallman, as is the Wallman compactification, and he co-authored an important monograph on dimension theory with Witold Hurewicz.[6] Wallman was also a radio enthusiast,[3] and in the postwar period co-authored a book comprehensively documenting what was known at the time about vacuum tube amplification technology,[7] including new developments such as showing how the central limit theorem could be used to describe the rise time of cascaded circuits. At Chalmers, Wallman helped build the Electronic Differential Analyser, an early example of an analog computer,[8] and performed pioneering research in biomedical engineering combining video displays with X-ray imaging.[9]
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