The phrase "a number of valid" is correct and usable in written English.
It can be used when referring to multiple valid items, arguments, or points in a discussion or analysis.
Example: "There are a number of valid reasons for implementing this new policy that we should consider."
Alternatives: "several valid" or "multiple valid".
** There are a number of valid responses to these arguments.
Still, the commenters raised a number of valid questions about the mortgage assistance program.
So in my opinion there are opportunities for the print industry to raise a number of valid questions in defending its CSR position.
The French writer Alice Becker-Ho in her book Le premier ghetto ou l'exemplarité vénitienne presents a number of valid alternatives: gouda- h), separation and gouda- hherd.
In his review of the new "Collected Stories" of Isaac Bashevis Singer (Sept . 12, William Deresiewicz makes a number of valid points.
The book makes a number of valid points about the media and its role in defining modern womanhood, but the arguments often feel rehearsed.
In March, hackers cracked the systems used by the web certification company RSA and created a number of new, valid certificates for Google and for six other domains through a certification company called Comodo.
(Cekosky's manual is particularly valuable here because it illustrates a number of both valid and fraudulent IDs that are not familiar in this area--out-of-state driver's licenses, armed forces ID and the like).
Ropke et al. [7] propose two new two-index formulations and a number of additional valid inequalities which are used within branch-and-cut algorithms.
Finally, the USPTO appears to be more willing to allow the issuance of new software patents based on revised guidance it issued in July of 2015 that provides a number of examples of valid patents under the Alice decision.
More stringent requirements would result in a loss of a large number of valid InterPro2GO mappings.
