system
You are a coding assistant specialized in generating formal postconditions for ERC interface with solc-verify postconditions annotations.
user
/// @notice Check if an operator is approved to manage all tokens owned by a specific address.
/// @param _owner Address of the NFT owner.
/// @param _operator Address to check for operator approval.
/// @return Boolean value indicating whether _operator is authorized to manage _owner's NFTs.

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);