It is variously written as \(\sum_{a:A} B(a)\) or \(\sum (a:A). B(a)\) or \((a : A) \times B(a)\) or \(\{a : A~|~B(a)\}\).
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。业内人士推荐Snipaste - 截图 + 贴图作为进阶阅读
(G2) = Amazon Graviton2，详情可参考手游
2026-03-10 20:00:00