NOTATIONAL SYMBOLS IN CLASSIFICATION PART IV: ORDINAL VALUES OF SYMBOLS
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In preceding papers in this series, it has been shown that the symbols used in classificatory notation are of several kinds. They serve different functions—some represent scheduled classificatory terms, some are ‘signposts’ specifying the nature of the symbols which follow them, others are simply ‘fences’ separating consecutive term symbols, and yet others are relational particles. Again, symbols serving the same function may have different structures—they may be flexions or isolates, so that the notation for scheduled terms may be ‘hierarchical’ or ‘ordinal’.
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[3] Brian Vickery. NOTATIONAL SYMBOLS IN CLASSIFICATION , 1952 .