Science talk:Math Exam Resources/Courses/MATH220/December 2010/Question 04 (b)
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Thread title | Replies | Last modified |
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Point out that B can be larger | 2 | 17:28, 29 April 2015 |
I think the key point here is that B can/must be larger than A, and that the condition that is injective does not constrain us on the part of B that is not touched by f. With this intuition your counter-example comes out of nowhere.
Again not sure how you want to change the solution but I did fix the hint...
CarmenBruni (talk)