I am not a native English speaker/writer, but I am working on a technical thesis written in English. To me, for some unknown reason, it feels natural to write the following:
However, the simplicity of the theory implies that it is not possible in reality, lest someone would surely have already done it.
Googling for the definition of lest seems to imply that this is not a correct usage.
So, can I use lest like I do, and if not, do any of you also feel there is any merit to my spontaneous feeling that it actually is ok to use it here? The first answer of this post (Is this usage of "lest" possible?) seems to support my case, but i am not sure.