Twice
Twice a week means two days a week. Example: Monday and Wednesday, or, Tuesday and Friday. Once in two weeks means once every fourteen days.
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Twice-differentiable simply means that the function can be differentiated twice. eg. If y = x^5 (^5 means to the power of 5). Then y' = 5x^4 (i.e. differentiating once) Then y'' = 20x^3 (differentiating twice)
Twice-differentiable simply means that the function can be differentiated twice. eg. If y = x^5 (^5 means to the power of 5). Then y' = 5x^4 (i.e. differentiating once) Then y'' = 20x^3 (differentiating twice)
Trust once betrayed is not easily restored
Does it mean what it seems to mean? That is how you tell.Let's look at it - "Once a man, twice a child" would mean that you are a child twice, and a man once - or, you are childish, then you grow up, then you grow old and become childish again.So it's not an idiom because an idiom would not make sense unless you knew exactly what it meant. It must be a proverb.
Measure twice, cut once..
Measure twice cut once
Measure twice, cut once.
night at the museum But it's a very old proverb from way back.
Twice
Well "Once" means one time. For example: "once upon a time..."
You say "Fool me once, shame on you! Fool me twice, shame on me!"This means, if you play a trick on me and I fall for it, shame on you for fooling me. But if you play a trick on me and I fall for it again, then shame on me for being foolish.
Twice a week means two days a week. Example: Monday and Wednesday, or, Tuesday and Friday. Once in two weeks means once every fourteen days.
This is not a biblical proverb but one of man's - born needing help, adulthood stands on their own, old age needing help again is its premise.
Repeated measurement ensures that errors are avoided or reduced. In woodwork there is an old saying, "Measure twice, Cut once."