Projection (mathematics) (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Projection (mathematics)" in English language version.

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Lee, John M. (2012). Introduction to Smooth Manifolds. Graduate Texts in Mathematics. Vol. 218 (Second ed.). p. 606. doi:10.1007/978-1-4419-9982-5. ISBN 978-1-4419-9982-5. Exercise A.32. Suppose $X_{1},\ldots ,X_{k}$ are topological spaces. Show that each projection $\pi _{i}:X_{1}\times \cdots \times X_{k}\to X_{i}$ is an open map.

"Relational Algebra". www.cs.rochester.edu. Archived from the original on 30 January 2004. Retrieved 29 August 2021.

"Relational Algebra". www.cs.rochester.edu. Archived from the original on 30 January 2004. Retrieved 29 August 2021.

Lee, John M. (2012). Introduction to Smooth Manifolds. Graduate Texts in Mathematics. Vol. 218 (Second ed.). p. 606. doi:10.1007/978-1-4419-9982-5. ISBN 978-1-4419-9982-5. Exercise A.32. Suppose $X_{1},\ldots ,X_{k}$ are topological spaces. Show that each projection $\pi _{i}:X_{1}\times \cdots \times X_{k}\to X_{i}$ is an open map.