"Diagrams are of great utility for illustrating certain questions of vital statistics by conveying ideas on the subject through the eye, which cannot be so readily grasped when contained in figures." (Florence Nightingale, "Mortality of the British Army", 1857)
"Diagrams are sometimes used, not merely to convey several pieces of information such as several time series on one chart, but also to provide visual evidence of relationships between the series." (Alfred R Ilersic, "Statistics", 1959)
"Diagrams, whether representational or symbolic, are meaningless unless attached to some body of theory. On the other hand theories are in no need of diagrams save for psychological purposes. Let us then keep theoretical models apart from visual analogues." (Mario Bunge, "Philosophy of Physics", 1973)
"Schematic diagrams are more abstract than pictorial drawings, showing symbolic elements and their interconnection to make clear the configuration and/or operation of a system." (Ernest O Doebelin, "Engineering experimentation: planning, execution, reporting", 1995)
"[...] (4) Diagrams are psychologically useful, but prove nothing; (5) Diagrams can even be misleading [...]" (James R Brown,"Philosophy of Mathematics", 1999)
"A model diagram declares some sets and binary relations, and imposes some basic constraints on them. A diagram is a good way to convey the outline of a model, but diagrams aren’t expressive enough to include detailed constraints." (Daniel Jackson, "Software Abstractions", 2006)
"[...] diagrams are models, graphical in nature, that are used to illustrate structure (e.g., how components are physically interconnected); they do not capture functional behavior of a system. " (Robbie T Nakatsu, "Diagrammatic Reasoning in AI", 2010)
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