Introducing i-Computer

There are two main screens for the syntax and presentation of the algebraic expression, and two screens for errors.

"Syntax error" screen	"Definition Error" screen
This is where syntax errors are displayed as you type the expression (click to see all of them)	This is where invalid mathematical definitions are displayed when calculating the expression
Tap on the screen, and a popup will appear displaying the description of the syntax errors that have been identified.	Definition errors will appear during the calculation of the algebraic expression, and the calculation will stop at the point where the error occurs.

Screen 1:	by keyboard	video
	An interactive touch screen where you can syntax and correct the algebraic or arithmetic expression with the keyboard format . To modify or cancel the content, you can use the control buttons. you might scroll vertically to view the entire screen

Screen 2	by hand	video
	Here the expression is presented as one would write it by hand , in the classic mathematical format. The calculated numerical value is also presented you might zoom and drag a double-tap gesture resets the algebraic expression to its default scale and position

Buttons of specific numbers

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This button is used for the number φ (phi)
φ = 0,618033988749894...

The number $\varphi ={\displaystyle \frac{\sqrt{5}-1}{2}}$$\phi = \dfrac{\sqrt{5} - 1} {2}$ expresses the division of a line segment in mean and extreme ratio. It is an irrational number, yet it can be constructed with a ruler and compass!! ...a strange property makes it the king of irrationals!!

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This button is used for the number Φ (Phi)
Φ = 1,618033988749894...

The numbers $\varphi ={\displaystyle \frac{\sqrt{5}-1}{2}}$$\phi = \dfrac{\sqrt{5} - 1} {2}$ and $\mathrm{\Phi }={\displaystyle \frac{\sqrt{5}+1}{2}}$$\Phi = \dfrac{\sqrt{5} + 1} {2}$ , ( $\mathrm{\Phi }={\displaystyle \frac{1}{\varphi }}=\varphi +1$$\Phi = \dfrac{1} {\phi} = \phi + 1$ ) were named after the sculptor Phidias, who had used the golden ratio in the sculptures of the Parthenon. Since the golden ratio is considered to produce ideal aesthetic results, the number φ appears—more than any other number—in various forms of artistic expression, such as sculpture and painting. Artists like Michelangelo, Raphael, Da Vinci, Dali, and many others incorporated the golden ratio into their works. It also appears in nature, where numerous formations seem to follow the golden ratio or spiral patterns based on it, such as the Fibonacci spiral.

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This button is used for the number π (pi)
π = 3,14159265358979...

The number π (also known as Archimedes' constant) derives its name from the Greek word 'περιφέρεια' (periphery). It emerged from the effort to calculate the circumference of a circle and represents the constant ratio of a circle’s circumference to its diameter. Because of this, it appears frequently in various mathematical practices and calculations. However, π is not constructible with a ruler and compass—a fact that was not initially known. The ultimately fruitless effort to achieve this became known in history as the problem of 'squaring the circle.' This challenge became an obsession for many mathematicians (and not only) over more than 1500 years—known as the 'hunters of pi'—as they attempted to calculate more and more of its digits. Even today, computing additional digits of π remains a benchmark for testing the reliability and performance of supercomputers. The number π is also connected to countless equations and formulas, for example: $\arcsin \left({\displaystyle \frac{1}{2}}\right)={\displaystyle \frac{\pi }{6}}$$\arcsin\left(\dfrac{1}{2}\right) = \dfrac{\pi}{6}$ .

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This button is used for the number e 
e = 2,71828182845904... 

The number e was named in honor of the mathematician Euler. It was discovered by the Swiss mathematician Jacob Bernoulli on the compound interest problem. It is an irrational number, defined by the limit $e=\underset{n\to +\mathrm{\infty }}{lim}(1+{\displaystyle \frac{1}{n}}{)}^n$$e = \lim_{n \to +\infty}(1+\dfrac{1}{n})^n$ . Perhaps the most well-known relation involving e is $e^{ix}=\cos (x)+i\sin (x)$$e^{ix} = \cos(x)+ i\sin(x)$ which, when evaluated at $x=\pi$$x =\pi$ gives the famous relation $e^{i\pi }+1=0$$e^{i\pi} + 1 =0$ , Euler's identity.

Control button

Buttons	video	video
this button deletes the entire algebraic expression
this button deletes the last single character but not Mathematical functions "log, cos ... If you want to delete a Mathematical function or a larger part of the algebraic expression look at the video.
this button inserts the blank character (also, it is used in conjunction with the undo button to delete a larger part of the algebraic expression)
this button undoes the last input in the algebraic expression (also, it is used in conjunction with the blank character button to delete a larger part of the algebraic expression )

rules - guide for the correct syntax of algebraic expressions

degrees & rad

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The degree is a unit of measurement for angles or arcs in a circle.
One degree is equal to 1/360 of a full circle. 

Although circles may differ in size and their degrees "correspond" to different arc , a central angle of a given number of degrees always refers to the same angular size, even though the corresponding arc length varies depending on the radius of the circle. Degrees express a percentage of the circle and are subdivided as follows: $1\mathrm{°}={60}^{\prime },1^{\prime }={60}^{″}$$1\degree = 60' , 1' = 60''$ .

For example, writing $1.23\mathrm{°}$$1.23\degree$ is incorrect. Although conversion is not difficult, it is generally preferable to use the radian as the unit of measurement for arcs and angles.

By default, the input to trigonometric functions is in radians(rad).

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A radian is equal to an arc that has a length as the radius.