Deletion of Problems of the Day

Comment: per . The book does not find significant coverage in reliable sources independent of the subject. This book cannot be considered to be notable simply because it has been used as a reference in works of Sohail Inayatullah. The sources need to address the topic directly and in detail for it to meet the general notability guideline
Stance: delete
Cited policy: Wikipedia:Notability (WP:SIGCOV)