3 ms·
Technically ∞ is an element of the projective real line: R U {∞}. +∞ and -∞ are distinct elements in the extended real number system: R U {-∞, +∞}.
by throwawaymath 8y ago
Technically ∞ is an element of the projective real line: R U {∞}. +∞ and -∞ are distinct elements in the extended real number system: R U {-∞, +∞}.