I'm currently writing a paper of my results in a field of pure mathematics.
My work is a generalization of an already existing result, which is not mine. My adviser and I think that there is a substantial differences between my result and the already existing result, and so it's worth a publication.
Since I'm generalizing an already existing paper it will be very convenient both for me and the readers that I will use the same notations and definitions as in the other paper. So I wrote those down and cited the other authors.
The part of definitions and notations is roughly 10%-15% of the whole paper, and even though I properly cited the other authors, I'm worried to be accused of plagiarism by the "automatic plagiarism detector", which I heard most journals use.
How can I avoid being falsely accused for plagiarism?