Question about notation (hyperplanes)

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SUMMARY

The discussion centers on the notation for hyperplanes in the context of a function mapping into the hyperplane defined as {u in ℝ5: u5=1}. The confusion arises from interpreting u5 as either the fifth power of u or the fifth coordinate of the vector u. The clarification provided indicates that u5 refers to the fifth coordinate, leading to the correct interpretation of the hyperplane as consisting of points of the form (a, b, c, d, 1). This distinction is crucial for understanding the geometry of the problem.

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Homework Statement


I have a question for which I'm supposed to show that a function maps into "a hyperplane {u in ℝ5:u5=1}".

Does this mean that the target space is the set of vectors in ℝ5 such that the dot product of u with itself (5 times) is 1? Doesn't seem right...

Any clarification is appreciated.

EDIT: I think I figured it out. The u^5 is meant to denote the 5th coordinate, which makes a lot of sense in my case. Thank you for reading anyways.
 
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That's right. This is the "plane" of all points of the form (a, b, c, d, 1).
 
Did the original problem use superscripts (u5) or subscripts (u5)? The latter form would make it clearer that it's talking about the 5th coordinate of a vector in R5, rather than the 5th power of some number u.
 

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