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Keywords:
lattice-ordered group ($\ell $-group); free $\ell $-group; free product of $\ell $-groups; sub-product class of $\ell $-groups
lattice-ordered group ($\ell $-group); free $\ell $-group; free product of $\ell $-groups; sub-product class of $\ell $-groups
Summary:
In this paper we have given the construction of free $\ell $-groups generated by a po-group and the construction of free products in any sub-product class $\Cal U$ of $i\ell$-groups. We have proved that the $\Cal U$-free products satisfy the weak subalgebra property.
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