The love formula

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$$\huge x^2+(\frac{5y}{4} -\sqrt {|x|})^2=1$$ Just playing around, off course any non graphics calculator cannot render the graph. But its a cute equation.
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What is RPN keystroke programming

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 RPN (Reverse Polish Notation) is a type of keystroke programming that is used in calculators and computer programs to perform mathematical operations. In RPN, instead of writing expressions in the traditional way (e.g. 2 + 3 = 5), the operands (i.e. the numbers) are entered first, followed by the operator (e.g. +).

For example, to add 2 and 3 in RPN, you would first enter the number 2, then enter the number 3, and finally press the + key to perform the addition. The result of the calculation (5) would then be displayed.

RPN entry

[2]
[ENTER]
[3]
[+]

Algebraic entry

[2]
[+]
[3]
[=]

The answer is given in the LCD panel as 5. There is no '=' (equal) sign. The calculation is done when you pressed '+'.

The main advantage of RPN is that it eliminates the need for parentheses, which can be confusing and error-prone, especially for complex expressions.

(10-5)(3+7x2)  = 85

RPN entry

[7]
[ENTER]
[2]
[*]
[3]
[+]
[10]
[5]
[-]
[*]

Algebraic entry

[7]
[*]
[2]
[+]
[3]
[m+] ... Store the answer in memory
[10]
[-]
[5]
[*]
[RM] ... Recall the last answer

RPN also requires fewer keystrokes to perform the same calculation, making it faster and more efficient for some users. Another great advantage is the stack. Some new graphical calculators also have a 'stack'. The stack is a list of last digits and calculations done. On the DM15L you only have the last 4 digits, on the HP50G, HP Plus and some other HP graphical calculators, your stack is as big as your calculators memory.

Who invented RPN (Reverse Polish Notation)

Reverse Polish Notation (RPN) was invented by the Polish mathematician Jan Łukasiewicz in the early 1920s. He developed RPN as a more efficient and convenient way to represent mathematical expressions and perform calculations.

RPN was initially used for manual calculations, but it was later adopted for use in early electronic calculators, where it became a popular way to perform mathematical operations. Today, RPN is still used in some specialized calculators and computer programs, although it is not as widely used as traditional infix notation (e.g. 2 + 3 = 5).

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