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 May 3 comment Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a Thanks for your question. I figured out that my example was a bit to minimal. I changed the question such that now it is clear where the infinite recursion appears. May 3 revised Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a deleted 59 characters in body; edited title May 3 comment Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a Sorry for the confusion. I tried to find a minimal example and it was too minimal (and I did not see that some old Attributes were still set). I edit the question... May 3 revised Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a added 205 characters in body May 3 comment Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a @Rojo: otimes[anything] May 3 comment Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a @MarkMcClure: it also does not work with NonCommutativeMultiply. NonCommutativeMultiply[a] remains unevaluated. May 3 asked Constructing a function with Flat and OneIdentity attribute with the property that otimes[a]:>a Apr 25 revised Incorrect results for elementary integrals when using Integrate added 23 characters in body Apr 25 revised Incorrect results for elementary integrals when using Integrate added 216 characters in body Apr 25 comment Incorrect results for elementary integrals when using Integrate @Searke: thank you for the suggestion, I will do so. Apr 25 comment Incorrect results for elementary integrals when using Integrate @Szabolcs: the condition which has to be met is $\operatorname{Re} x > 0$. However, I do not believe that it is because of this condition that the integral cannot be performed. Mathematica also does not produce a result for the specific case $x=1$. Apr 25 revised Incorrect results for elementary integrals when using Integrate added 466 characters in body Apr 25 revised Incorrect results for elementary integrals when using Integrate added 6 characters in body Apr 25 comment Incorrect results for elementary integrals when using Integrate Oh, my mistake. Apr 25 asked Incorrect results for elementary integrals when using Integrate Apr 16 awarded Teacher Apr 16 answered Sophistication of Series[…] Mar 12 comment Does Mathematica have advanced indexing? @nikie: you are implicitly assuming that the elements of evaluatedCondition are either 0 or 1. This is not always the case (see the code for the || part). I guess the code should be modified slightly not to produce strange result in the case that the condition invokes an Or statement. Mar 3 awarded Supporter Mar 3 awarded Scholar