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Measurement of the matter distribution in the universe is one of the key components in observational cosmology. This provides an important test of structure formation scenarios and cosmological models. I discuss two aspects of this test: (1) comparing the matter distribution around galaxy clusters from galaxy redshift surveys with that from weak-lensing surveys and (2) statistical comparison of large-scale structure between observations and cosmological simulations. These tests underscore the importance of mapping the large-scale structure of the universe for exploring and understanding cosmology and structure formation. I emphasize the power of combining observations including redshift and weak-lensing surveys with cosmological simulations. |
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