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The momentum is negated at the end in such a way as to make the operation reversible . As used by the typewriter industry , however , the term " function " is limited to an operation other than ( a ) impressing a type-member * against a record-medium * to imprint a character * ( which thereby concurrently effects a character-space * ) , or ( b ) effecting a word-space * . Exceptions might include identification and record keeping systems , and maintaining strict requirements for any potentially non-organic aspects of the operation such as dyes . The momentum is negated in such a way as to make the operation reversible . This class defines the operations common to all reference objects . With many authors claiming sub-pixel accuracy in their registration procedures we show that the operations necessary for producing a series of images aligned to sub-pixel accuracy can significantly alter the statistical properties of the images .