The symbol , first used in set theory and logic by Giuseppe Peano and now used in mathematics in general for set membership ("belongs to"), evolved from the letter epsilon, since the symbol …

The ε (epsilon) symbol is a Greek letter used in math as a variable to represent error bounds and in calculus to represent the epsilon-delta definition of limits.

Dec 5, 2025 · In mathematics, the symbol epsilon (ε) is used to denote a very small positive quantity. It appears in topics like limits, calculus, analysis, inequalities, approximation, and …

Greek alphabet letters and symbols. Greek letters pronunciation.

The greek letter epsilon, written $\epsilon$ or $\varepsilon$, is just another variable, like $x$, $n$ or $T$. Conventionally it's used to denote a small quantity, like an error, or perhaps a term …

Jul 2, 2025 · What is epsilon in mathematics? Epsilon (ε), a lowercase Greek letter, is a ubiquitous symbol in mathematics, particularly within the realms of calculus, analysis, and numerical …

Learn about the Greek letter Epsilon (ε), its pronunciation, usage examples, and common applications in mathematics, science, and engineering.