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The least common multiple of the denominators of two fractions is the "lowest common denominator" (lcd), and can be used for adding, subtracting or comparing the fractions. The least common multiple of more than two integers a , b , c , . . . , usually denoted by lcm( a , b , c , . . .) , is defined as the smallest positive integer that is ...
This article includes the world record progression for the 4×200 metres freestyle relay, and it shows the chronological history of world record times in that competitive swimming event. The 4×200 metres freestyle relay is a relay event in which each of four swimmers on a team swims a 200-metre freestyle leg in sequence.
[f] ^ For the SCM women's 200 free American Record, Allison Schmitt swam a faster time at the 2009 Duel in the Pool (1:51.67); however, the time has not been recognized as a record by USA Swimming. [g] ^ For the SCM women's 400 IM American Record , Julia Smit at the 2009 Duel in the Pool set a then-World Record of 4:21.04; however, this time ...
In short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991. The drop in world record times in 2008-2009 coincided with the introduction of polyurethane suits from Speedo ( LZR , 50% polyurethane ) in 2008 and by Arena ( X-Glide ), Adidas (Hydrofoil) and Italian swimming suit manufacturer ...
On 25 July 2013, FINA Technical Swimming Congress voted to allow world records in the long course mixed 400 free relay and mixed 400 medley relay, as well as in six events in short course metres: the mixed 200 medley and 200 free relays, as well as the men's and women's 200 free relays and the men's and women's 200 medley relays. [6]
It is possible to set an individual world record in the 50 metres backstroke by swimming the backstroke first leg of the 4×50-metre medley relay, except in the mixed relay. [5] Swimming the other three legs of the medley relay cannot qualify as world records as FINA criteria require a "static start" for world record recognition – swimming ...
The first world record in the 400 metres individual medley in long course (50 metres) swimming was recognized by the International Swimming Federation (FINA) in 1957, followed by the women a year later. In the short course (25 metres) swimming events the world's governing body recognizes world records since March 3, 1991.
In the short course (25 metres) swimming events, the world's governing body recognizes world records since 3 March 1991. Times have consistently dropped over the years due to better training techniques, new developments in the sport and swimwear changes (e.g. goggles were not widely used until the 1970s, providing for considerable expansion of ...