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CONTRACTIONS ON π_k SPACES
<正> Let π_k be a Pontrjagin space, which has a maximal seminegative subspace with k dimensions, and (.,.) be the indefinite inner product on π_k. A linear bounded operator T is called a contraction, if (Tx, Tx)≤(x, x ) for any x∈π_k.
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Chinese Science Bulletin
1990年20期

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