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What (who) is 4-4-2 2-4-4 - definition
WIKIMEDIA DISAMBIGUATION PAGE
4-2-4; 4–2–4; 4-2-4 (disambiguation)
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.
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
1 − 2 + 4 − 8 + ⋯
INFINITE SERIES
1 − 2 + 4 − 8 + 16 − · · ·; 1 + 2 + 4 + 8 +...; 1 + 2 + 4 + 8 +..; 1 + 2 + 4 + 8 +.; 1+2+4+8.; 1+2+4+8..; 1+2+4+8+..; 1+2+4+8+.; 1 − 2 + 4 − 8 + · · ·; 1 − 2 + 4 − 8 + …; 1 − 2 + 4 − 8 + ...
In mathematics, is the infinite series whose terms are the successive powers of two with alternating signs. As a geometric series, it is characterized by its first term, 1, and its common ratio, −2.
Wikipedia
424 (disambiguation)
424 is a year in the 5th century of the Gregorian calendar.
424 or 4-2-4 may also refer to:
- 424 BC, a year in the 5th century BC of the Gregorian calendar
- MÁV Class 424, a class of Hungarian steam locomotives
- Area code 424, California, United States
- 4-2-4 (locomotive), a steam locomotive configuration in Whyte notation
- 4-2-4 (association football), an association football (soccer) field formation
