# utils

- [Context](/elin/contracts-4.3.1/utils/context.md)
- [Strings](/elin/contracts-4.3.1/utils/strings.md)
- [introspection](/elin/contracts-4.3.1/utils/introspection.md)
- [ERC165](/elin/contracts-4.3.1/utils/introspection/erc165.md)
- [IERC165](/elin/contracts-4.3.1/utils/introspection/ierc165.md)
- [math](/elin/contracts-4.3.1/utils/math.md)
- [SafeMath](/elin/contracts-4.3.1/utils/math/safemath.md)