product map
Notation: If is a collection of sets (indexed by ) then denotes the generalized Cartesian product of .
Let and be collections of sets indexed by the same set and a collection of functions.
The product map is the function
0.1 Properties:
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If and are collections of functions then
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is injective if and only if each is injective.
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is surjective if and only if each is surjective.
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Suppose and are topological spaces. Then is continuous (http://planetmath.org/Continuous) (in the product topology) if and only if each is continuous.
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Suppose and are groups, or rings or algebras. Then is a group (ring or ) homomorphism if and only if each is a group (ring or ) homomorphism.
Title | product map |
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Canonical name | ProductMap |
Date of creation | 2013-03-22 17:48:28 |
Last modified on | 2013-03-22 17:48:28 |
Owner | asteroid (17536) |
Last modified by | asteroid (17536) |
Numerical id | 6 |
Author | asteroid (17536) |
Entry type | Definition |
Classification | msc 03E20 |