SigurdV skrev:Algotezza skrev:Fast det beror på var man placerar nollan i tempsystemet... hur den definieras...https://en.wikipedia.org/wiki/Additive_identity
In mathematics the additive identity of a set which is equipped with the operation of addition
is an element which, when added to any element x in the set, yields x.
One of the most familiar additive identities is the number 0 from elementary mathematics,
but additive identities occur in other mathematical structures where addition is defined, such as in groups and rings.
In mathematics, the additive inverse of a number a is the number that, when added to a, yields zero.
This number is also known as the opposite (number), sign change, and negation.
For a real number, it reverses its sign:
the opposite to a positive number is negative,
and the opposite to a negative number is positive.
Zero is the additive inverse of itself
Om du viker tal-linjen mellan positiva och negativa nollan får du en annan familj än den jag började med:
<+0 , -0>
<+1 , -1>
<+1/0 , -1/0> [/quote]
1 (one, also called unit, unity, and (multiplicative) identity) is a number, numeral, and glyph.
It represents a single entity, the unit of counting or measurement.
For example, a line segment of unit length is a line segment of length 1.
It is also the first of the infinite sequence of natural numbers, followed by 2.
In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/x or x−1, is a number which when multiplied by x yields the multiplicative identity, 1. The multiplicative inverse of a fraction a/b is b/a. For the multiplicative inverse of a real number, divide 1 by the number. For example, the reciprocal of 5 is one fifth (1/5 or 0.2), and the reciprocal of 0.25 is 1 divided by 0.25, or 4. The reciprocal function, the function f(x) that maps x to 1/x, is one of the simplest examples of a function which is its own inverse (an involution).
Och familjen med inverser har du redan sett:
< 0 , 1/0 >
< 1/2 , 2 >
< 1 , 1 >
< 2 , 1/2 >
< 1/0 , 0 >
Den första är rätt tråkig men den här kan man ju göra ett Möbius band med...