→ srarr

⇒ rAarr

□ square

≤ leq

≥ geq

< lt

> gt

= equals

≠ nedot

∈ isinv

∉ notinva

⊂ subset

⊆ subseteqq

⊈ nsubseteqq

⊇ supseteqq

⊉ nsupseteqq

⊃ supset

∪ cups

∩ caps

× times

µ micro

ε

λ

α

β

γ

δ

θ

μ

ω

Σ

∅