Algebra borrows symbols from arithmetic and adds its own.
Quick check
What does the symbol ∈ mean?
A quick glossary
- = equals, ≠ not equal, ≈ approximately equal, ≡ identically equal / defined as.
- <, > less/greater than, ≤, ≥ less/greater than or equal.
- ∝ proportional to, ∞ infinity.
- ∑ sum, ∏ product, √ square root, ! factorial.
- ∈ element of, ⊂ subset of, ∪ union, ∩ intersection, ∀ for all, ∃ there exists, ∴ therefore.
Your turn
Translate into words: ∀x ∈ ℝ, x² ≥ 0.
Common symbols
- = equals, ≠ not equal
- <, >, ≤, ≥ comparison
- ≈ approximately, ∝ proportional to
- ∞ infinity, ∑ sum, ∏ product
- ∈ member of, ∀ for all, ∃ there exists