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(\mathrm j^p_0f',\mathrm j^q_xg)
=\left(\mathrm j^p_0(f\circ f'),\mathrm j^q_0\left(\sigma\cdot(g\cdot f'^{-1}\cdot f^{-1})\right)\right)</math>
이를 <math>P</math>의 <math>(p,q)</math>차 '''주연장'''(主延長, {{llang|en|principal prolongation}})이라고 한다.<ref name="KMS">{{서적 인용|last1 = Kolář|first1=Ivan|last2=Michor|first2=Peter|last3=Slovák|first3=Jan|url=http://www.emis.de/monographs/KSM/kmsbookh.pdf|title=Natural operations in differential geometry|날짜 = 1993|publisher = Springer-Verlag|doi=10.1007/978-3-662-02950-3|isbn=978-3-540-56235-1|zbl=0782.53013|언어=en|확인날짜=2016-12-18|보존url=https://web.archive.org/web/20170330154524/http://www.emis.de/monographs/KSM/kmsbookh.pdf|보존날짜=2017-03-30|깨진링크=예}}</ref>{{rp|150–151, §15.3}}<ref>{{저널 인용|arxiv=math/0201235|제목=Reductive ''G''-structures and Lie derivatives|이름=Marco|성=Godina|이름2=Paolo|성2=Matteucci|doi=10.1016/S0393-0440(02)00174-2|저널=Journal of Geometry and Physics|권=47|날짜=2003|쪽=66–86|bibcode=2003JGP....47...66G|zbl=1035.53035|언어=en}}</ref>{{rp|Definition 3.4}}
== 성질 ==
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