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An example is the relation "is equal to", because if a = b is true then b = a is also true. If R T represents the converse of R, then R is symmetric if and only if R = R T. [2] Symmetry, along with reflexivity and transitivity, are the three defining properties of an equivalence relation. [1]
Female humans and other primates find faces with high levels of symmetry and masculinity more attractive, especially at high fertility. Having symmetrical features may indicate that an individual possesses high-quality genes related to health, and that they developed in a stable environment with little disease or trauma. [ 38 ]
The four relational models are as follows: Communal sharing (CS) relationships are the most basic form of relationship where some bounded group of people are conceived as equivalent, undifferentiated and interchangeable such that distinct individual identities are disregarded and commonalities are emphasized, with intimate and kinship relations being prototypical examples of CS relationship. [2]
In symmetrical relationships, the pattern of interaction is defined by two people responding to one another in the same way. This is a common pattern of interaction within power struggles. In complementary relationships, the participants respond to one another in opposing ways.
Thus, a d-variate distribution is defined to be mirror symmetric when its chiral index is null. The distribution can be discrete or continuous, and the existence of a density is not required, but the inertia must be finite and non null. In the univariate case, this index was proposed as a non parametric test of symmetry. [2]
In Gestalt psychology it is known as identifying a figure from the background. For example, black words on a printed paper are seen as the "figure", and the white sheet as the "background". For example, black words on a printed paper are seen as the "figure", and the white sheet as the "background".
However, certain situations in which people remain in relationships cannot fully be explained by this model alone. Examples include relationships in which outside alternatives are likely better, including abusive relationships. [4] For this reason, the investment model was theorized to further predict relationships like these.
For example, if part of a shape's border is missing people still tend to see the shape as completely enclosed by the border and ignore the gaps. This reaction stems from the mind's natural tendency to recognize patterns that are familiar and thus fill in any information that may be missing.