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单词 perpetuant
释义

perpetuantn.

Brit. /pəˈpɛtʃʊənt/, /pəˈpɛtjʊənt/, U.S. /pərˈpɛtʃəw(ə)nt/
Origin: A borrowing from Latin. Etymons: Latin perpetuant-, perpetuāns.
Etymology: < classical Latin perpetuant-, perpetuāns, present participle of perpetuāre perpetuate v.With sense 1 compare earlier perpetuana n.
1. = perpetuana n. Obsolete. rare.
ΘΚΠ
the world > textiles and clothing > textiles > textile fabric or an article of textile fabric > textile fabric > textile fabric made from specific material > made from wool > [noun] > stout or durable > perpetuana
perpetuana1601
perpet1704
perpetuant1754
1754 E. Bowen Map of Devon The chief Manufactures [of Devon] are Kerseys, Serges, Druggets, Perpetuants, fine and coarse Cloths, and Lace, in all which many Families are employd.
2. Mathematics. A semi-invariant which is not reducible to a sum (or sum of products) of semi-invariants of lower degree. Now rare.
ΘΚΠ
the world > relative properties > number > algebra > [noun] > expression > function > invariant > semi-invariant
peninvariant1860
semi-invariant1860
perpetuant1882
subinvariant1882
syzygant1882
1882 J. J. Sylvester in Amer. Jrnl. Math. 5 105 It may be convenient to give a name to absolutely indecomposable subinvariants, and I propose, until an apter word presents itself, to call them perpetuants.
1910 Encycl. Brit. I. 638/1 In this case the ground forms, called also perpetuants, have been enumerated and actual representative seminvariant forms established.
1948 Philos. Trans. (Royal Soc.) A. 241 424 The first two forms are reduced by Turnbull, but his reduction of (i), based on his ‘perpetuant reduction’ is not very easy to follow.
This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).
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n.1754
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