Blackboard bold, Bold, Fraktur, and Reserved Variable. Young authors (and some older ones) seem to prefer blackboard bold to plain bold for the standard number systems (and or they pick it up by osmosis on web sites such as this one), and the notation is now entrenched
Login – ΠΑΝΕΠΙΣΤΗΜΙΟ ΚΥΠΡΟΥ ΧΡΗΣΙΜΕΣ ΣΥΝΔΕΣΕΙΣ Κατάλογος με διαδικτυακά μαθήματα Blackboard Βlackboard self service Teams Σύντομος Οδηγός χρήσης Microsoft Teams ΠΡΟΣΦΑΤΕΣ ΑΠΑΝΤΗΣΕΙΣ E- exams!
ΕΓΓΡΑΦΕΣ – ΠΑΝΕΠΙΣΤΗΜΙΟ ΚΥΠΡΟΥ ΧΡΗΣΙΜΕΣ ΣΥΝΔΕΣΕΙΣ Κατάλογος με διαδικτυακά μαθήματα Blackboard Βlackboard self service Teams Σύντομος Οδηγός χρήσης Microsoft Teams ΠΡΟΣΦΑΤΕΣ ΑΠΑΝΤΗΣΕΙΣ E- exams!
Numbers on a blackboard - Mathematics Stack Exchange The numbers $1$ to $2025$ are written on a blackboard and the following process is repeated for as long as there are enough numbers left: Three numbers are chosen The largest two of these three