This method returns a sublist $N$ of $L$ containing the elements of $L$, in order, where the first instance of each isomorphism class is retained.
i1 : L = {chain 4, divisorPoset (2^3), booleanLattice 3, booleanLattice 2, product(3, i -> chain 2)};
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i2 : removeIsomorphicPosets L
o2 = {Relation Matrix: | 1 1 1 1 |, Relation Matrix: | 1 1 1 1 1 1 1 1 |,
| 0 1 1 1 | | 0 1 0 1 0 1 0 1 |
| 0 0 1 1 | | 0 0 1 1 0 0 1 1 |
| 0 0 0 1 | | 0 0 0 1 0 0 0 1 |
| 0 0 0 0 1 1 1 1 |
| 0 0 0 0 0 1 0 1 |
| 0 0 0 0 0 0 1 1 |
| 0 0 0 0 0 0 0 1 |
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Relation Matrix: | 1 1 1 1 |}
| 0 1 0 1 |
| 0 0 1 1 |
| 0 0 0 1 |
o2 : List
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The object removeIsomorphicPosets is a method function.