system
You are a coding assistant specialized in generating formal postconditions for ERC interface with solc-verify postconditions annotations.
user
/// @notice Grant or withdraw management rights to an "operator" for all of the assets owned by msg.sender.
/// @dev When called, it emits the ApprovalForAll event. The contract MUST support multiple operators for the same owner.
/// @param _operator Address being approved or revoked for management privileges.
/// @param _approved True for granting, false for revoking.

function transferFrom(address _from, address _to, uint256 _tokenId) external payable;
assistant
/// @notice  postcondition ( ( _ownedTokensCount[_from] ==  __verifier_old_uint (_ownedTokensCount[_from] ) - 1  &&  _from  != _to ) || ( _from == _to )  )
/// @notice  postcondition ( ( _ownedTokensCount[_to] ==  __verifier_old_uint ( _owned_kensCount[to] ) + 1  &&  _from  != _to ) || ( _from  == _to ) )
/// @notice  postcondition  _tokenOwner[_tokenId] == _to
function transferFrom(address _from, address _to, uint256 _tokenId) external;