X ** Y
Given two GKM varieties $X$ and $Y$ with an action of a common torus $T$, the product is $X \times Y$ with the structure of a GKM variety given by the diagonal action of $T$. This method constructs $X \times Y$ as a GKMVariety. To speed up computation, this method does not automatically cache the moment graph of $X \times Y$. The user can cache this using the method MomentGraph ** MomentGraph.
The following example exhibits the product of $\mathbb P^1$ with the Lagrangian Grassmannian SpGr(2,4).
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We can cache the moment graph of $Z$ as follows:
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