A club set is a subset of a limit ordinal which is closed under the order topology, and is unbounded. For example, the set of all countable limit ordinals is a club set with respect to the first uncountable ordinal; but it is not a club set with respect to any higher limit ordinal, since it is neither closed nor bounded.
A golf clubset according to claim 1, in which the difference in the distance y between the highest number club in the set of the wood type and the lowest number club in the set of the iron type is less than 5 mm.
A golf clubset according to claim 1, in which the distance y for each of the clubs is within the range of approximately -5 to 5 mm.
Because all the clubs of such a golf clubset, have a feeling close to that of irons, the wood and iron clubs can be used properly when the golfer changes the club which he uses from the former to the latter and, therefore, a missed shot occurs only rarely.
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