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Index
- First three properties of complexity
- Subcomplexities
- Ceiling of a subcomplexity
- Maximum of two subcomplexities. A truncated subcomplexity.
- Subcomplexity
First three properties of complexity
Every Ł-string features character at least one time. It follows that for every natural number . On the other hand, since Ł-string represents , it follows that , hence:
\[ \mathit{rn}(1) = 1\]
That’s the first of the three properties. Now let be two arbitrary natural numbers; and let Ł-strings be such that:
- and ;
- and
Then Ł-string represents (has value) . It follows that:
\[ \mathit{rn}(a\ b\ +)\ \ \le\ \ \mathit{RN}(”AB+”)\ \ =\ \ \mathit{RN}(”A”)\ \mathit{RN}(”B”)\ + \]
\[ =\ \ \mathit{rn}(a)\ \mathit{rn}(b)\ + \]
We see that
\[ \forall_{a\ b\ \in\ \mathbb N}\quad \mathit{rn}(a\ b\ +)\quad\le\quad \mathit{rn}(a)\ \mathit{rn}(b)\ + \]
and this is the second property of complexity . A very similar proof justifies also the third property:
\[ \forall_{a\ b\ \in\ \mathbb N}\quad \mathit{rn}(a\ b\ \bullet)\quad\le\quad \mathit{rn}(a)\ \mathit{rn}(b)\ + \]
Subcomplexities
DEFINITION 0 A real positive function is called a subcomplexity satisfies the following three properties:
We can see from the First three properties that the complexity function is a subcomplexity. Furthermore, a simple induction on natural numbers shows that is the greatest subcomplexity, meaning that for every subcomplexity the following inequality holds:
\[ \forall_{n\in\mathbb N}\ \ \gamma(n)\le\mathit{rn}(n) \]
Ceiling of a subcomplexity
We will see that the ceiling of a subcompolexity is a subcomplexity.
Let be an arbitrary real number. Then the floor and the ceiling are defined as the integers which satisfy inequalities:
\[ t-1\ <\ \lfloor t\rfloor\ \le t \]
\[ t\ \le\ \lceil t\rceil\ <\ t+1 \]
Such integers are unique for every real . They have the following properties for every real and integer :
We will apply the latter property. Let be an arbitrary subcomplexity. Let be given by:
\[ \forall_{n\in\mathbb N}\quad \delta(n) := \lceil \gamma(n)\rceil \]
(one could write ). Then hence . Thus has the first property of subcomplexities.
Now let be two arbitrary natural numbers. Then
\[\gamma(a\ b\ +)\ \ \le\ \ \gamma(a) \gamma(b)\ +\ \ \le\ \ \delta(a)\ \delta(b)\ + \]
The -expression on the right is an integer. Thus, by the definition of , and by the general property of the operation ceiling (see above), we get:
\[ \delta(a\ b\ +)\ \ \le\ \ \delta(a)\ \delta(b)\ + \]
Thus has the second property of a su8bcomplexity. A proof of the third property:
\[ \delta(a\ b\ \bullet)\ \ \le\ \ \delta(a)\ \delta(b)\ + \]
is very similar.
Maximum of two subcomplexities. A truncated subcomplexity.
Let be two arbitrary subcomplexities. Define their maximum in the usual way:
\[ \forall_{n\in\mathbb N}\quad \gamma(n)\ \ :=\ \ \max(\alpha(n)\ \ \beta(n)) \]
Then, as it is easy to prove, is a subcomplexity too.
Let be an arbitrary subcomplexity. Let be an arbitrary positive real number. Define the truncated function as follows:
\[ \forall_{n\in\mathbb N}\quad \gamma_M(n)\ \ :=\ \ \min(\gamma(n)\ \ M) \]
It is easy to prove that the truncated function is a subcomplexity–call it the truncated subcomplexity.
POTENTIAL APPLICATION Let be a subcomplexity, and let be such that for every . Then define as follows:
Then is a subcomplexity too–call it an improved subcomplexity.
Subcomplexity
Let’s define function as follows:
\[ \forall_{k\in\mathbb N}\quad m_5(k)\ \ :=\ \ \min(k\ \ 5) \]
First of all which means that function has the first subcomplexity property.
Now let be two arbitrary natural numbers. Then
which show that has the second property of a subcomplexity:
\[ \forall_{a\ b\in \mathbb N}\quad m_5(a\ b\ +)\ \ \le\ \ m_5(a)\ m_5(b)\ + \]
Furthermore, if then and , hence
\[ \min(a\ b) = 1\quad\Rightarrow\quad m_5(a\ b\ \bullet)\ =\ \ m_5(\max(a\ b)) \]
\[ <\ \ \ 1\ \ m_5(\max(a\ b))\ \ +\ \ \ =\ \ \ m_5(a)\ m_5(b)\ + \]
-- i.e. the third subcomplexity property holds when . Next, if (so that ) then
\[ m_5(a\ b\ \bullet)\ =\ 4\ \ =\ \ m_5(a)\ m_5(b)\ + \]
Finally, let the remaining possibility hold: and . Then and hence
\[ m_5(a\ b\ \bullet)\ \ \ \le\ \ \ 5\ \ \ \le\ \ \ m_5(\min(a\ b))\ \ m_5(\max(a\ b))\ \ + \]
\[ =\ \ \ m_5(a)\ m_5(b)\ + \]
We see that the third subcomplexity property holds in every case, i.e.
\[ \forall_{a\ b\in \mathbb N}\quad m_5(a\ b\ \bullet)\ \ \le\ \ m_5(a)\ m_5(b)\ + \]
We have proven that function is a subcomplexity.
THEOREM 0 for every .
PROOF Indeed,
\[ k\ =\ m_5(k)\ \le\ \mathit{rn}(k)\ \le\ k \]
for every . END of PROOF