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  2. Consanguinity - Wikipedia

    en.wikipedia.org/wiki/Consanguinity

    Consanguinity (from Latin consanguinitas 'blood relationship') is the characteristic of having a kinship with a relative who is descended from a common ancestor. Many jurisdictions have laws prohibiting people who are closely related by blood from marrying or having sexual relations with each other.

  3. Relation (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Relation_(mathematics)

    In mathematics, a relation denotes some kind of relationship between two objects in a set, which may or may not hold. [1] As an example, " is less than " is a relation on the set of natural numbers ; it holds, for instance, between the values 1 and 3 (denoted as 1 < 3 ), and likewise between 3 and 4 (denoted as 3 < 4 ), but not between the ...

  4. Exogamy - Wikipedia

    en.wikipedia.org/wiki/Exogamy

    Morgan [7] maintains that exogamy was introduced to prevent marriage between blood relations, especially between brother and sister, which had been common in an earlier state of promiscuity. Frazer [ 8 ] says that exogamy was begun to maintain the survival of family groups, especially when single families became larger political groups.

  5. Systems of Consanguinity and Affinity of the Human Family

    en.wikipedia.org/wiki/Systems_of_Consanguinity...

    [2] [3] In the book Morgan argues that all human societies share a basic set of principles for social organization along kinship lines, based on the principles of consanguinity (kinship by blood) and affinity (kinship by marriage). At the same time, he presented a sophisticated schema of social evolution based upon the relationship terms, the ...

  6. Prohibited degree of kinship - Wikipedia

    en.wikipedia.org/wiki/Prohibited_degree_of_kinship

    In law, a prohibited degree of kinship refers to a degree of consanguinity (blood relatedness), or sometimes affinity (relation by marriage or sexual relationship) between persons that makes sex or marriage between them illegal. An incest taboo between parent and child or two full-blooded siblings is a cultural universal.

  7. Want to improve brain health? Here are 12 questions to ask ...

    www.aol.com/want-improve-brain-health-12...

    An article in the medical journal Neurology lists specific questions people should ask their neurologist or primary care physicians to asses and improve their brain health. ... Blood pressure ...

  8. Logical consequence - Wikipedia

    en.wikipedia.org/wiki/Logical_consequence

    The Polish logician Alfred Tarski identified three features of an adequate characterization of entailment: (1) The logical consequence relation relies on the logical form of the sentences: (2) The relation is a priori, i.e., it can be determined with or without regard to empirical evidence (sense experience); and (3) The logical consequence ...

  9. List of fallacies - Wikipedia

    en.wikipedia.org/wiki/List_of_fallacies

    Outline of public relations – Overview of and topical guide to public relations; Map–territory relationRelationship between an object and a representation of that object (confusing map with territory, menu with meal) Mathematical fallacy – Certain type of mistaken proof