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u4.com		thanks for your visiting to u4.com site.
u4		this u4 is an abbreviation of universal formation.
universal formation		the concept of the universal formation includes any types of formation. then, it can has various type of characteristics, simultaneously. it is elastic and/or plastic. in some cases,it has both characteristics simultaneously. it's process can be linear and/or nonlinear such as hysteresis. it's structure can be single and simple, or complex with hierarchy.
other u4		there are many u4 in our world. for example. unit 4 ufo (unidentified flying object) you for etc.
		some of them are as follows. metro line u4 (Austria)
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