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In genealogy and in phylogenetic studies of evolutionary biology, antecedents or antecessors are predecessors in a family line. For example, one is the descendant of their grandparents, who are one's antecedents. This term has particular utility in evolutionary coalescent theory, which models the process of genetic drift in reverse time. [1]
Antecedent (behavioral psychology), the stimulus that occurs before a trained behavior; Antecedent (genealogy), antonym of descendant, genealogical predecessor in family line; Antecedent (logic), the first half of a hypothetical proposition; Antecedent moisture, in hydrology, the relative wetness condition of a catchment
When an organism perceives an antecedent stimulus, it behaves in a way that maximizes reinforcing consequences and minimizes punishing consequences. This might be part of complex, interpersonal communication. The definition of antecedent is a preceding event or a cause- in this case it is the event that causes the learned behavior to happen. [1]
In this example, the first premise is a conditional statement in which "P" is the antecedent and "Q" is the consequent. The second premise "affirms" the antecedent. The conclusion, that the consequent must be true, is deductively valid. A mixed hypothetical syllogism has four possible forms, two of which are valid, while the other two are invalid.
Ancient history covers all continents inhabited by humans in the period 3000 BC – AD 500, ending with the expansion of Islam in late antiquity. [1] The three-age system periodises ancient history into the Stone Age, the Bronze Age, and the Iron Age, with recorded history generally considered to begin with the Bronze Age. The start and end of ...
The date used as the end of the ancient era is arbitrary. The transition period from Classical Antiquity to the Early Middle Ages is known as Late Antiquity.Late Antiquity is a periodization used by historians to describe the transitional centuries from Classical Antiquity to the Middle Ages, in both mainland Europe and the Mediterranean world: generally from the end of the Roman Empire's ...
An antecedent is the first half of a hypothetical proposition, whenever the if-clause precedes the then-clause. In some contexts the antecedent is called the protasis. [1] Examples: If , then . This is a nonlogical formulation of a hypothetical proposition. In this case, the antecedent is P, and the consequent is Q.
The span of recorded history is roughly 5,000 – 5,500 years, beginning with Sumerian cuneiform, the oldest form of writing discovered so far. Although the ending date of ancient history is disputed, currently most Western scholars use the fall of the Western Roman Empire in 476 AD or the coming of Islam in 632 AD as the end of ancient history.