olemus
operaator, mille operandid võivad ilmuda rööbiti
= an operator in which operands can occur in parallel

näiteid
https://www.omg.org/ocup-2/documents/concurrency_in_uml_version_2.6.pdf

https://math.stackexchange.com/questions/50340/what-is-the-intuition-behind-the-par-operator-in-linear-logic