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What (who) is 4 2-kiloyear event - definition

SEVERE CLIMATIC EVENT; DEFINES THE BEGINNING OF THE MEGHALAYAN AGE; STARTED IN CA. 2200 BCE; LASTED THE ENTIRE 22ND CENTURY BCE; RELATED TO THE COLLAPSES OF THE OLD KINGDOM IN EGYPT, AKKADIAN EMPIRE, LIANGZHU CULTURE, AND INDUS VALLEY CIVILIZATION

22nd century BCE drought; 22nd century BC drought; 4.2ka event; Circa 2200 BC climate event; 4.2 kiloyear event

1 − 2 + 3 − 4 + ⋯

INFINITE SERIES

1 - 2 + 3 - 4 + · · ·; 1 - 2 + 3 - 4 + …; 1 - 2 + 3 - 4 + ...; 1 − 2 + 3 − 4 + …; 1−2+3−4+···; 1-2+3-4+···; 1-2+3-4+…; 1-2+3-4+...; 1−2+3−4+…; 1−2+3−4+...; 1-2+3-4+; 1-2+3-4; 1−2+3−4+; 1−2+3−4; 1 − 2 + 3 − 4 +; 1 − 2 + 3 − 4; 1 - 2 + 3 - 4 +; 1 - 2 + 3 - 4; 1 − 2 + 3 − 4 + . . .; 1 - 2 + 3 - 4 + . . .; 1 − 2 3 − 4 · · ·; 1 - 2 + 3 - 4 ...; 1 − 2 + 3 − 4 + · ·; 1 − 2 + 3 − 4 + ·; 1- 2 + 3 - 4; 1 − 2 + 3 − 4 + ...; 1 − 2 + 3 − 4 + ···; 1 − 2 + 3 − 4 + · · ·

In mathematics, 1 − 2 + 3 − 4 + ··· is an infinite series whose terms are the successive positive integers, given alternating signs. Using sigma summation notation the sum of the first m terms of the series can be expressed as

https://en.wikipedia.org/wiki/1_−_2_+_3_−_4_+_⋯

2-4-4-2

ARTICULATED LOCOMOTIVE WHEEL ARRANGEMENT

2-4-4-2T

In Whyte notation, 2-4-4-2 refers to a railroad steam locomotive that has two leading wheels followed by four coupled driving wheels, a second set of four coupled driving wheels, and two trailing wheels.

https://en.wikipedia.org/wiki/2-4-4-2

2 Chronicles 4

SECOND BOOK OF CHRONICLES, CHAPTER 4

2 Chronicles 4:2

2 Chronicles 4 is the fourth chapter of the Second Book of Chronicles the Old Testament of the Christian Bible or of the second part of the Books of Chronicles in the Hebrew Bible. The book is compiled from older sources by an unknown person or group, designated by modern scholars as "the Chronicler", and had the final shape established in late fifth or fourth century BCE.

https://en.wikipedia.org/wiki/2_Chronicles_4

Wikipedia

4.2-kiloyear event

The 4.2-kiloyear (thousand years) BP aridification event (long-term drought) was one of the most severe climatic events of the Holocene epoch. It defines the beginning of the current Meghalayan age in the Holocene epoch.

Starting around 2200 BC, it probably lasted the entire 22nd century BC. It has been hypothesised to have caused the collapse of the Old Kingdom in Egypt as well as the Akkadian Empire in Mesopotamia, and the Liangzhu culture in the lower Yangtze River area. The drought may also have initiated the collapse of the Indus Valley Civilisation, with some of its population moving southeastward to follow the movement of their desired habitat, as well as the migration of Indo-European-speaking people into India.

Some scientists disagree with that conclusion, citing evidence that the event was not a global drought and did not happen in a clear timeline.

https://en.wikipedia.org/wiki/4.2-kiloyear event