In algebraic topology, the mapping spectrum F ( X , Y ) {\displaystyle F(X,Y)} of spectra X, Y is characterized by
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![{\displaystyle [X\wedge Y,Z]=[X,F(Y,Z)].}](https://wikimedia.org/api/rest_v1/media/math/render/svg/ae9522055fd7563739043595cae93e969d27374c)
