const math.E

2 uses

	math (current package)
		const.go#L12: 	E   = 2.71828182845904523536028747135266249775724709369995957496696763 // https://oeis.org/A001113

	src.elv.sh/pkg/eval/mods/math
		math.go#L488: 	"e":  vars.NewReadOnly(math.E),