(Q2226660)
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Wikipedia(3 entries)
- dewiki Satz von Gleason-Kahane-Żelazko
- hewiki משפט גליסון-כהנא-ז'לאזקו
- plwiki Twierdzenie Gleasona-Kahane-Żelazki
theorem that a nonzero linear functional on a unital complex Banach algebra is multiplicative iff it maps each element of the Banach algebra to an element of its spectrum