Unfortunately, the use of LSE directly in this case can again cause overflow/underflow problems. The term underflow is most commonly used for floating-point math and not for integer math. But, many references can be found to integer underflow. The slurry feed was attained from the underflow of a functioning bituminous coal-cleaning thickener device. Even when using gradual underflow, the nearest value may be zero. In most floating point systems, the underflow level is smaller than the machine epsilon. Usually "p" is not directly computed using the above formula due to floating-point underflow. This is called a "queue underflow" situation. The term "underflow" normally refers to floating point numbers only, which is a separate issue. In older designs, the underflow gap had just one usable value, zero. The river water will then either form an underflow or an interflow within the lake. "I/O underflow" was inspired in part by Alan Turing.