## On ordinal sums of triangular norms on bounded lattices.(English)Zbl 1099.06004

Summary: Ordinal sums have been introduced in many different contexts, e.g., for posets, semigroups, t-norms, copulas, aggregation operators, or quite recently for hoops. In this contribution, we focus on ordinal sums of t-norms acting on some bounded lattice which is not necessarily a chain or an ordinal sum of posets. Necessary and sufficient conditions are provided for an ordinal sum operation yielding again a t-norm on some bounded lattice whereas the operation is determined by an arbitrary selection of subintervals as carriers for arbitrary summand t-norms. In this way also the structure of the underlying bounded lattice is investigated. Further, it is shown that up to trivial cases there are no ordinal sum t-norms on product lattices in general.

### MSC:

 06B05 Structure theory of lattices 03E72 Theory of fuzzy sets, etc.

### Keywords:

triangular norm; ordinal sum; horizontal sum; bounded lattice
Full Text:

### References:

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