Important Symbols

⇒ rArr

∪ cups

∩ caps

∈ isinv

∉ notinva

⊂ subset

⊆ subseteqq

⊈ nusbseteqq

⊃ supset

⊇ supseteqq

⊉ nsupseteqq

← slarr

↑ uparrow

→ srarr

↓ downarrow

↦ mapsto

□ square

∃ exist

∄ nexists

ℕ naturals

ℙ primes

ℚ rationals

ℝ reals

ℤ integers

∅ varnothing