“The equilibrium… in order to become static—should be steady, permanent, lasting. …This type of equilibrium… is… independent of any scale. A reduced model will show the same effects as the proper structure. Experiments on models are simple and… instrumental for understanding such structural problems.”

— Eduardo Torroja

Philosophy of Structures (1958)

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Eduardo Torroja 29

Spanish architect 1899–1961

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Eduardo Torroja (1899–1961) Spanish architect

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“The real significance of the Russell paradox, from the standpoint of the modal-logic picture, is this: it shows that no concrete structure can be a standard model for the naive conception of the totality of all sets; for any concrete structure has a possible extension that contains more 'sets.'”

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