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He stated that architecture is the most expensive of all arts and that

architecture should follow rational and unchanging rules in order to prevent
extravagant expansion.

His theory based on Mathematical Reason: Architecture no need to look for

explanations outside the field or for transcental justification.

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“The aim of architecture is public and private utility, the happiness and the
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“ h i f r h t c u e i p b i n r a e u i y e h p i e s n e
protection of individuals and of society”. (Durand p.84)
The "convenience" of any building and the "economy" of the figure of the
project and its construction should be subject to principle.
Convenience: Economy:
- Stability, The principle of profitability therefore relates to
- Health the efficiency of the design , clear technical
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-Comfort: computation, and the logistical execution of
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-Symmetry, building work.
-Regularity
-Simplicity.
Durans’s rationalist
constructive based
funtionalist approached grid system of composition.
Jean-Nicolas-Louis Durand, Lectures on Architecture (Précis des leçons
d'architecture données à l'École Polytechnique) ,