Surgery obstruction

In mathematics, specifically in surgery theory, the surgery obstructions define a map $\theta \colon \mathcal{N} (X) \to L_n (\pi_1 (X))$ from the normal invariants to the L-groups which is in the first instance a set-theoretic map (that means not necessarily a homomorphism) with the following property when $n \geq 5$ :

单词	Surgery obstruction
释义	Surgery obstruction 英语百科 Surgery obstruction In mathematics, specifically in surgery theory, the surgery obstructions define a map $\theta \colon \mathcal{N} (X) \to L_n (\pi_1 (X))$ from the normal invariants to the L-groups which is in the first instance a set-theoretic map (that means not necessarily a homomorphism) with the following property when $n \geq 5$ :
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