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Pascal's triangle, rows 0 through 7. The hockey stick identity confirms, for example: for n =6, r =2: 1+3+6+10+15=35. In combinatorics , the hockey-stick identity , [ 1 ] Christmas stocking identity , [ 2 ] boomerang identity , Fermat's identity or Chu's Theorem , [ 3 ] states that if n ≥ r ≥ 0 {\displaystyle n\geq r\geq 0} are integers, then
In mathematics, Pascal's rule (or Pascal's formula) is a combinatorial identity about binomial coefficients.It states that for positive natural numbers n and k, + = (), where () is a binomial coefficient; one interpretation of the coefficient of the x k term in the expansion of (1 + x) n.
Montreal Canadiens hockey uniform of Sheldon Souray, on display at the Canadian Museum of History. Players in the National Hockey League wear equipment which allows their team affiliation to be easily identified, unifying the image of the team. An NHL uniform consists of a hockey jersey, hockey pants, socks, gloves, and a helmet.
An ice hockey stick is a piece of equipment used in ice hockey to shoot, pass, and carry the puck across the ice. Ice hockey sticks are approximately 150–200 cm long, composed of a long, slender shaft with a flat extension at one end called the blade. National Hockey League (NHL) sticks are up to 63 inches (160 cm) long. [1]
Early hockey sticks of English manufacture. In field hockey, each player carries a stick and cannot take part in the game without it. The stick for an adult is usually in the range 89–95 cm (35–38 in) long. A maximum length of 105 cm (41.3") was stipulated from 2015. [1] The maximum permitted weight is 737 grams. [2]
The National Hockey League rules are the rules governing the play of the National Hockey League (NHL), a professional ice hockey organization. Infractions of the rules, such as offside and icing , lead to a stoppage of play and subsequent face-offs , while more serious infractions lead to penalties being assessed to the offending team.
The tuck rule is a rule by the National Hockey League (NHL) that stipulates how jerseys must be worn over protective equipment. Notable players who have previously tucked in their jerseys include Alexander Ovechkin , Evgeni Malkin , Patrice Bergeron , [ 1 ] Kris Letang , Pavel Datsyuk , Wayne Gretzky and Jaromir Jagr . [ 2 ]
The goals are smaller than in field hockey: 2m high by 3m wide and a minimum of 1m deep (this is the same size as handball goals as early indoor hockey used existing handball courts). A team consists of six [ 1 ] players on the pitch, one of whom is a goalkeeper , with a maximum 12 players on a team.
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