Irreducible components of affine Variety

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SUMMARY

The irreducible components of the affine variety W=V(x^2-y^2, y^2-z^2) can be determined through the intersection of the varieties V(x^2-y^2) and V(y^2-z^2). The first variety decomposes into V(x-y) and V(x+y), while the second decomposes into V(y-z) and V(y+z). The intersection results in lines represented by the equations x^2 = y^2 = z^2, leading to straightforward solutions that reveal the structure of the components.

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I am having problems finding the irreducible components of the variety
W=V(x^2-y^2, y^2-z^2)
the 1st part gives x+y, x-y, the second y+z, y-z, but I am pretty sure they are connected!
 
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So you have V(x^2-y^2,y^2-z^2) = V(x^2-y^2) \cap V(y^2-z^2) = \left(V(x-y) \cup V(x+y) \right) \cap \left(V(y-z) \cup V(y+z) \right)

Do some elementary set theory, and you should arrive at the components. They will be lines.
 
or just look at the equations as x^2 = y^2 = z^2. the solutions look pretty simple.
 

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