"Problems in Mathematical Analysis" by B.P. Demidovich is a classic resource frequently available in PDF format through online repositories and academic blogs. Additional notable problem collections include the three-volume series by Kaczor & Nowak, covering real numbers, continuity, and integration. For a direct PDF download of the Demidovich text, you can access Thunv's Blog . problems-in-mathematical-analysis-d.pdf - Thunv
