| Answer | Crossword Clue |
|---|---|
| GMT | All clocks are set by it: Abbr. |
| GMT | All clocks are set by it (Abbr.) |
| DST | Summer clocks are set to it: Abbr. |
| DST | When clocks are set ahead: Abbr. |
| GMT | Letters that clocks are set by |
| invariant | (of a subgroup) having the property that the same set of elements results when all the elements of the subgroup are operated on consistently on the left and consistently on the right by any element of the group; invariant |
