> For the complete documentation index, see [llms.txt](https://peri-finance.gitbook.io/perifinance/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://peri-finance.gitbook.io/perifinance/development-resources/source-code-description/libraries/untitled-1.md).

# SafeMath

PeriFinancer uses OpenZeppelin's [SafeMath](https://docs.openzeppelin.com/contracts/2.x/api/math#SafeMath) library to ensure that, in basic arithmetic operations, overflows and zero division revert the transactions they occur in.