- Mecca (Wikipedia)
Mecca (/ˈmɛkə/; officially Makkah al-Mukarramah, commonly shortened to Makkah) is the capital of Mecca Province in the Hejaz region of western Saudi Arabia and the holiest city according to Islam. It is 70 km (43 mi) inland from Jeddah on the Red Sea, in a narrow valley 277 m (909 ft) above sea level. Its last recorded population was 2,385,509 in 2022. Its metropolitan population in 2022 was 2.4 million, making it the third-most populated city in Saudi Arabia after Riyadh and Jeddah. Around 44.5% of the population are Saudi citizens and around 55.5% are foreigners from other Muslim countries. Pilgrims more than triple the population number every year during the Ḥajj pilgrimage, observed in the twelfth Hijri month of Dhūl-Ḥijjah. With over 10.8 million international visitors in 2023, Mecca was one of the ten most visited cities in the world.
- Georg Cantor (Wikipedia)
Georg Ferdinand Ludwig Philipp Cantor (/ˈkæntɔːr/ KAN-tor; German: [ˈɡeːɔʁk ˈfɛʁdinant ˈluːtvɪç ˈfiːlɪp ˈkantoːɐ̯]; 3 March [O.S. 19 February] 1845 – 6 January 1918) was a mathematician who played a pivotal role in the creation of set theory, which has become a fundamental theory in mathematics. Cantor established the importance of one-to-one correspondence between the members of two sets, defined infinite and well-ordered sets, and proved that the real numbers are more numerous than the natural numbers. Cantor’s method of proof of this theorem implies the existence of an infinity of infinities. He defined the cardinal and ordinal numbers and their arithmetic. Cantor’s work is of great philosophical interest, a fact he was well aware of.