Assume the manuscript format for referencing the equations is as "Eq. (i)". How can I properly refer to multiple equations at once? For example which of the followings is more acceptable?
- In Eq. (1), Eq. (2), Eq. (3), and Eq. (4)
- In Eq. (1,2,3,4) or Eq. (1-4)
- In Eqs. (1,2,3,4)
- Any better idea?