" 
 : There may well be an overlap in some of the articles, and this simply is accidental and temporary (see Timeline of modern scientific computing and my thoughts on Talk:Timeline of scientific computing). As these articles are spun out, the distinctions ""should"" begin to appear (so yes, hope that answers your question on whether or not (I think) it is neccesary to distinguish between them). By the way, this article is above the level of Timeline of numerical analysis after 1945.   "