Who was the first person who used the dual space? In which paper / book did he or she use the dual space?
Who was the first who called it dual space and in which paper / book?
Who was the first person who used the dual space? In which paper / book did he or she use the dual space?
Who was the first who called it dual space and in which paper / book?
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Stefan Banach in the "Théorie des opérations linéaires" is a good bet.