intrados
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Arch
An
arch is a curved
structure that
spans a space and may or may not support weight above it. Arch may be synonymous with
vault, but a vault may be distinguished as a continuous arch forming a roof. Arches appeared as early as the 2nd millennium BC in
Mesopotamian brick architecture, and their systematic use started with the
Ancient Romans who were
the first to apply the technique to a wide range of structures.
Autoregressive conditional heteroskedasticity
In
econometrics,
autoregressive conditional heteroskedasticity (ARCH) models are used to characterize and model
time series. They are used at any point in a series, the error terms are thought to have a characteristic size or
variance. In particular ARCH models assume the variance of the current
error term or
innovation to be a function of the actual sizes of the previous time periods' error terms: often the variance is related to the squares of the previous
innovations.
intrados
Noun
1. the interior curve of an arch
(hypernym) curve, curved shape
intrados
nm.
intrados, the interior curve of an arch, inner surface
Intrados
(n.)
The interior curve of an arch; esp., the inner or lower curved face of the whole body of voussoirs taken together. See Extrados.
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter.
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intrados