Subtraction is the inverse of addition. 2. Either of two numbers or quantities that cancel each other out under a given mathematical operation. For example, the inverse of 5 under multiplication is 1 / 5, since 5 Ã 1 / 5 = 1.
Peptic ulcer disease refers to painful sores or ulcers in the lining of the stomach or first part of the small intestine, called the duodenum. No single cause has been found for ulcers. However, it is now clear that an ulcer is the end result of an imbalance between digestive fluids in the stomach and duodenum. Most ulcers are caused by an infection with a type of bacteria called Helicobacter pylori (H. pylori).
Peptic ulcer disease is a general term for ulcers that occur in the lining of the stomach or of the duodenum (upper part of the small intestine). 1  A peptic ulcer is an erosion or sore in the wall of the gastrointestinal tract. 2  The mucous membrane lining the digestive tract erodes and causes a gradual breakdown of tissue.