In sentences like ‘The speed 10 seconds later is 3 m/s’ the amount of time is easy to specify. But what can I do if it is a complex phrase? In particular, I should like to express v(t + dt) in words, where v is speed, t is an instant and t + dt is a later instant in which dt reads ‘the amount of time it takes for the picket fence to travel 5 cm’. I cannot just squeeze this phrase in front of ‘later’, can I? Is there a phrase like ‘later BY an amount of time’?

Thank you in advance for any useful tip.

  • Simply say "This will happen at a certain time later, as given by the mathematical expression ....." OK?
    – Fattie
    Commented Jun 17, 2015 at 19:09
  • Thank you very much, but unfortunately I cannot use it as my aim is to resolve a mathematical expression in words. Otherwise I could just say ‘dt later, where dt is given by...’. I wanted to avoid introducing a symbol solely for this purpose. Commented Jun 17, 2015 at 19:15
  • i would probably encourage you to ask on the math stackexchange site
    – Fattie
    Commented Jun 18, 2015 at 2:42

1 Answer 1


Use after:

The speed after the time it takes the picket fence to travel 5 cm is 3 m/s.

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