- #1

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I do not see how the conclusion follows from the fact that we can "choose" {(1,0), (1,-1)} as a basis for

**Z**²...

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In summary, the proof of the homology of the Klein Bottle involves choosing a non-standard basis for Z² and using the Mayer-Vietoris sequence. The homology group is Z + Z quotiented by the image of alpha, which is clearly 2Z. This results in H_1(K) = Z + Z/2Z.

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I do not see how the conclusion follows from the fact that we can "choose" {(1,0), (1,-1)} as a basis for

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matt grime

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- #3

owlpride

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How do you compute the quotient

[tex]\frac{\ker(d_n)}{\text{im}(d_{n+1})}[/tex]

? If you can express [tex]\ker(d_n)[/tex] and [tex]\text{im}(d_{n+1})[/tex] in terms of the same basis, then modding out is straight forward. That's why Wiki is choosing a non-standard basis for**Z**². Why don't you write out the sequence and the maps?

[tex]\frac{\ker(d_n)}{\text{im}(d_{n+1})}[/tex]

? If you can express [tex]\ker(d_n)[/tex] and [tex]\text{im}(d_{n+1})[/tex] in terms of the same basis, then modding out is straight forward. That's why Wiki is choosing a non-standard basis for

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- #4

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Actually, there is no need to talk about basis here since Im(alpha) is clearly just 2

The Klein Bottle is a non-orientable surface, meaning it cannot be properly colored or labeled, that was first described by German mathematician Felix Klein in the late 19th century. It is significant in mathematics because it provides an example of a surface that cannot exist in three-dimensional space, but can be visualized in four dimensions.

The M-V sequence, named after mathematicians Max Dehn and Wilhelm Magnus, is a sequence of moves used to describe the topology of the Klein Bottle. It shows how the Klein Bottle can be constructed from a square by identifying and gluing its edges in a specific way.

Two objects are homologous if they share a similar structure or pattern. In the context of the Klein Bottle and M-V sequences, homology refers to the fact that two different M-V sequences can produce the same Klein Bottle, indicating a topological equivalence between the two sequences.

The homology of the Klein Bottle is closely related to the concept of the fundamental group, which is a fundamental tool for studying the topology of surfaces. The Klein Bottle also has connections to other areas of mathematics such as algebraic topology and knot theory.

While the Klein Bottle itself may not have direct real-world applications, studying its homology and topological properties can have implications in fields such as physics, biology, and computer science. For example, the concept of non-orientability is relevant in the study of Möbius strips and the behavior of particles in quantum mechanics.

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