Estate/Gift Taxes & Relative Value

For the life of me I can’t get these formulas straight, partly cause I keep forgetting what the subscripts are about. Anybody have tricks to learning the formulas? And I know the g and e subscripts are gift and estate, but what are the ig and ie? “In gift” and “In estate”? Sorry, I don’t have the textbooks here…

ig - its probably taxes on income if gift is used ie - its probably taxes on income if estate transfer is used

Why to remeber formulas word by word, try to understand them and you’ll be fine.

To be honest I didn’t attempt to remember them there are just too many. I just try to understand the concepts like tax drag and the return implications of the taxes, no taxes etc