ZxZ is the Cartesian product of Z. You'd have met this a long time ago as co ordinates, (x,y) where both x and y are in Z. f is a function from Z to ZxZ, f (0) for example is (0,5).
Convert from fixed axis XYZ X Y Z rotations to Euler ZXZ Z X Z rotations Ask Question Asked 13 years, 10 months ago Modified 12 years ago
I find a similar post, which is Describe all ring homomorphisms from Z×Z into Z. I also know the difference between group and ring. But in this case, from ZxZ into Z, I'm so confused. The textbook ...
This proves that y y and z2 z 2 commute. The relation (R2) (R 2) then boils down to z =z2 z = z 2, which gives z = 1 z = 1. Because of the symmetries in the presentation, this proves that the group is trivial. Not very enlightening, but the fact that the corresponding group with 4 generators is highly nontrivial somehow reduces my hopes of ever finding a "good reason" for this group to be trivial.
Describe all ring homomorphisms of: a) Z Z into Z Z b) Z Z into Z ×Z Z × Z c) Z ×Z Z × Z into Z Z d) How many homomorphisms are there of Z ×Z ×Z Z × Z × Z into Z Z Note: These were past homework questions and my professor already gave out answers. I just need someone to help me understand and approach this type of problem. Thank you.
we know Z is a PID but there exists no ring isomorphism between ZxZ and Z. So based on this observation can we conclude that ZxZ is not a PID ? I dont think we can because if A and B are isomorphic...
2) The free product of Z*Z is not isomorphic to either Z\oplusZ or ZxZ; in fact, Z*Z is nonabelian (as most free products are). 3) SVK is unnecessary for computing pi_1 of the torus.
I know that $\\mathbb Z$ and $\\mathbb{Z}\\times\\mathbb{Z}$ have the same cardinality because you can create a bijection between the two. The example I was taught is Cantor's pairing function, which m...
Note that you never actually used the ring structure or the multiplicative property of a ring homomorphism here, just the Abelian group structure. In other words, since $\mathbb {Z} \times \mathbb {Z}$ is a free Abelian group on two generators, any group homomorphism out of it is entirely determined by its values on the two generators $ (1,0)$, $ (0,1)$.
The function f: ZxZ >Z defined by f (m, n) = 2m n is proven to be onto, as for every integer y, there exists at least one integer pair (m, n) such that f (m, n) = y. The proof demonstrates that if y is even, setting n = 0 yields m = y 2, and if y is odd, setting n = 1 yields m = (y 1) 2. Other functions discussed, such as f (m, n) = n^2 m^2 and f (m, n) = m^2 4, are shown not to be ...
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