איפיון של קבוצות קומפקטיות במרחב האוקלידי

New channel Yael Algom Kfir: title sample judged 'whole' (Every upload is a focused math lecture or proof walkthrough (topology, analysis, geometry) by a clear teaching channel w); passed a second screen for sellers/exam-prep/re-uploads; 0 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.