Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contrast to prefix or Polish notation (PN), in which operators precede their operands.

使用 传统逻辑 的计算器将在内部将表达式转换为上面的 rpn 形式。这可以通过在执行计算之前分析括号内的表达式来实现。实际上，rpn 计算器正是将此工作让给用户去做，从而在计算器中实现更简单的逻辑设计。

rpn是一些计算器使用的操作方式，主要由惠普公司制造。 RPN消除了在长时间计算期间输入括号的需要，并允许在计算过程中提供即时的反馈。 在获得反馈之前，你不需要输入冗长的操…

FMEA 故障模式和效应分析（Failure mode and effect analysis） RPN 风险优先数 （risk priority number） SOD是严重度（S 为Severity）、频度（O为Occurrence）和不可探测度（D为Detection ）等级的非算术组合。

What is RPN? Why Did/Does HP Use RPN? Learning RPN; What is RPN? In the 1920's, Jan Lukasiewicz developed a formal logic system which allowed mathematical expressions to be specified without parentheses by placing the operators before (prefix notation) or after (postfix notation) the operands. For example, the (infix notation) expression (4 + 5 ...

就是使用逆波兰输入法rpn的计算器啦。现在市面上做rpn的大概只有惠普一家了，基本上高端型号都有逆波兰输入方式可选择。

2021年8月29日 · The RPN Home entry mode has the →LIST function available when selecting a stack object, through the Stack menu. It collects the selected and underneath stack levels into a list. I find it useful to save into a list a set of numbers, unevaluated expressions or other objects to be used later (or other day).

RPN mode is the traditional way most HP calculators work. To add 1 and 2, keys are pressed in the order 1Ï2Ù. This mode is very suitable for calculations where the user is working towards a solution, without having a particular formula to work on.

RPN or Reverse Polish Notation is an efficient data entry method that eliminates the need to enter parentheses in equations, has been a favorite of HP calculator fans for more than 30 years, and it remains alive and well at HP.

RPN is short for Reverse Polish Notation. In RPN mode, numbers are entered first, separated by pressing [INPUT], followed by an operation key. Note: pressing [INPUT] is optional after entering a number if the next key pressed is an operation.