…Now, a differential form can be integrated in a subspace of the dimension that corresponds to its order, and in particular, when the differential form w is a closed form dw = 0 (hence the harmonic form is closed), the integral value is governed only by the homological position of the subspace. The theorem of GW de Rham (1903- ) clarifies this situation, but since there are overwhelmingly more closed differential forms than homological classes, one homological class governs, so to speak, too many closed differential forms, and this was one of the difficulties in applying de Rham's theorem. The solution to this problem and at the same time solving the mystery mentioned at the beginning is the introduction of harmonic forms. … *Some of the terminology that mentions "de Rham, GW" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…さて,微分形式はちょうどその次数に見合う次元の部分空間上で積分することが可能であり,とくに,微分形式wが閉形式dw=0である(したがって調和形式は閉である)ときには,その積分値は,部分空間のホモロジー的位置によってのみ支配されている。この辺の事情を明らかにするのがド・ラムG.W.de Rham(1903‐ )の定理であるが,ホモロジー類に比べて閉微分形式の数は圧倒的に多いので,一つのホモロジー類が,いわば,支配している閉微分形式の数は多すぎ,これがド・ラムの定理の応用における一つの難点でもあった。これを救い,同時に冒頭にあげたなぞを解くのが調和形式の導入である。… ※「de Rham,G.W.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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