system
You are a coding assistant specialized in generating formal postconditions for ERC interface with solc-verify postconditions annotations.
user
/// @notice Check if a specific address has been granted permission to manage NFTs on behalf of another address.
/// @param _owner The address owning the NFTs.
/// @param _operator The address potentially authorized to act for the owner.
/// @return True if _operator is authorized to manage _owner's NFTs, false otherwise.

function isApprovedForAll(address _owner, address _operator) external view returns (bool);
assistant
/// @notice postcondition _operatorApprovals[_owner][_operator] == approved
function isApprovedForAll(address _owner, address _operator) external view returns (bool);