Assertion: function | /r/HasProperty | needed
Facets:
Source sentences:
text: The functions that does not meet the requirements are still needed for both technical and practical reasons.[nb 12][nb 13]
text: The above spaces occur naturally in applications where functions having derivatives of certain orders are necessary; however, particularly in the study of partial differential equations, it can sometimes be more fruitful to work instead with the Sobolev spaces.