はてなブックマーク

At the top we have an interactive shell, where we can type calculations. The ⋙ is our prompt to this shell. Think of it like a calculator: you enter an expression, hit a button, and it tells you the answer. The next time you use the calculator, you clear whatever's in there and enter a new expression. Same here. To type the calculation above: Type "1+s" at the prompt (⋙). Notice we have chosen "1"