In logic, stratification is a layering of predicate symbols to guarantee unique interpretations and to avoid paradoxical definitions like Russell's paradox.
Stratification is a separate meaning as applied to manifolds, and singularity theory, of a decomposition into pieces with specified relationships on fitting together.
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In statistics, stratified sampling is a method of sampling from a population.
A stratified survey could thus claim to be more representative of the US population than a survey of simple random sampling or systematic sampling.
Stratified sampling techniques are generally used when the population is heterogeneous, or dissimilar, where certain homogeneous, or similar, sub-populations can be isolated (strata).
Stratified insole for a shoe according to claim 1, characterized in that the second layer in correspondence with the upper interface disposes of channels that develop from the anterior part, corresponding to the toe area of the insole, to the posterior part corresponding to the heel area of said layer of material.
Stratified insole for a shoe according to claim 1, wherein at least the second layer of insulating material is obtained from a compound on a base of SEBS block copolymers (styrene-ethylene-butadiene-styrene).
Stratified insole for a shoe according to claim 1, wherein the third layer of insulating material connected to said second layer is obtained from a compound based on SEBS block copolymers (styrene-ethylene-butadiene-styrene).
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