Many of the papers I’m reading leap between equations with phrases like

• “The equation may readily be solved to give [next equation which looks totally unlike previous equation],”
• “The reader may easily supply the details [of the derivation I read this paper to learn],” and
•  “[the next step I really need to make my model work] is obvious, and hence left as an exercise for the reader.”

Clearly I need to get a pair of the special glasses mathematicians must be wearing to make three pages of torturous algebraic manipulation and tricky rearrangements and substitutions “obvious.” Or perhaps “clear,” “obvious,” “trivial,” and “easy” are defined differently in math?