abstract = { In semantics and in programming practice, algebraic
  concepts such as monads or, essentially equivalently, (large)
  Lawvere theories are a well-established tool for modelling generic
  side-effects. An important issue in this context are combination
  mechanisms for such algebraic effects, which allow for the modular
  design of programming languages and verification logics. The most
  basic combination operators are sum and tensor: while the sum of
  effects is just their non-interacting union, the tensor imposes
  commutation of effects. However, for effects with unbounded arities,
  these combinations need not in general exist. Here, we introduce the
  class of uniform effects, which includes unbounded nondeterminism
  and continuations, and prove that the tensor does always exist if
  one of the component effects is uniform, thus in particular
  improving on previous results on tensoring with continuations. We
  then treat the case of nondeterminism in more detail, and give an
  order-theoretic characterization of effects for which tensoring with
  nondeterminism is conservative, thus enabling nondeterministic
  arguments such as a generic version of the Fischer-Ladner encoding
  of control operators.},
    year = {2011},
    title = {Powermonads and Tensors of Unranked Effects},
    booktitle = {Proceedings of the 26th Annual IEEE Symposium on  LOGIC IN COMPUTER SCIENCE. IEEE Symposium on Logic in Computer Science (LICS-2011), June 21-24, Toronto,, Ontario, Canada},
    note = {To appear},
    editor = {Martin Grohe},
    publisher = {IEEE Computer Society},
    author = {Sergey Goncharov and Lutz Schröder},
    keywords = {monads tensors non-determinism continuations unranked uniform order-theoretic conservativity},
    organization = {IEEE},
    namesNormalized4fulltext = {Sergey Goncharov; Lutz Schroder; Martin Grohe; Lutz Schroder; Sergey Goncharov},
    url = {http://arxiv.org/abs/1101.2777 https://www.dfki.de/web/forschung/publikationen/renameFileForDownload?filename=lics2011final_long.pdf&file_id=uploads_1054}