1️⃣2️⃣3️⃣...ℕ
👣➡️3️⃣0️⃣
⚀⚁⚁⚁⚁
1️⃣2️⃣3️⃣…➕
🕐🕑🕐🕑🕒🕓
🧸1️⃣🧸2️⃣🧸3️⃣...
...y1️⃣
4️⃣5️⃣6️⃣...
📈5️⃣..9️⃣➡️🅾️0️⃣
#countable set #natural numbers #math #set theory #enumeration #infinite list #counting sequence