# ableitbar

## English translation: differentiable

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
 German term or phrase: ableitbar English translation: differentiable Entered by:

 15:18 Jan 24, 2018
German to English translations [PRO]
Tech/Engineering - Medical: Instruments / Eyeglass lenses
 German term or phrase: ableitbar ....dass eine Fläche mit reduzierten Oberflächenunterschieden, insbesondere eine **kontinuierliche ableitbare Fläche**, erzielt wird. Context: Patent on manufacturing eyeglass lenses. Something (sorry, have to be vague) is applied to the lens blank to even out surface differences to achieve a "continuous ????? surface. The purpose is to reduce stresses during/after processing the lens. TIA Heike
 Heike HolthausUnited States Local time: 00:37
 differentiable Explanation:https://books.google.de/books?id=8YbbAAAAMAAJ&q="ableitbar" ... (not derivable, here: differentiable) https://math.stackexchange.com/questions/1117323/the-definit... From: https://en.wikipedia.org/wiki/Smoothness#Differentiability_c... : a continuously differentiable function is a continuous function whose derivative exists. All lenses are continuously differentiable! It's not a functioning lens until this is achieved There is some evidence for the use of "continuously differentiable" relating to lenses on google patents, although I tend to take those with a pinch of salt (e.g. http://www.google.ch/patents/CA1223142A?cl=en https://www.google.com/patents/US5137343) You can also see mathematical papers on lens design that refer to the (twice) "continuously differentiable" property e.g. https://arxiv.org/pdf/0704.1059.pdf--------------------------------------------------Note added at 4 hrs (2018-01-24 19:27:33 GMT)--------------------------------------------------Also this question on lenses is essentially synonymous (except for the zweimal which yours doesn't mention) https://www.proz.com/kudoz/german_to_english/other/631537-zw...
Selected response from:

Mair A-W (PhD)
Germany
Local time: 06:37
 Thank you4 KudoZ points were awarded for this answer

4 +2differentiable
 Mair A-W (PhD)

Discussion entries: 5

2 hrs   confidence: peer agreement (net): +2
differentiable

Explanation:
(not derivable, here: differentiable)

https://math.stackexchange.com/questions/1117323/the-definit...
From: https://en.wikipedia.org/wiki/Smoothness#Differentiability_c... : a continuously differentiable function is a continuous function whose derivative exists.

All lenses are continuously differentiable! It's not a functioning lens until this is achieved

There is some evidence for the use of "continuously differentiable" relating to lenses on google patents, although I tend to take those with a pinch of salt (e.g. http://www.google.ch/patents/CA1223142A?cl=en

You can also see mathematical papers on lens design that refer to the (twice) "continuously differentiable" property e.g. https://arxiv.org/pdf/0704.1059.pdf

--------------------------------------------------
Note added at 4 hrs (2018-01-24 19:27:33 GMT)
--------------------------------------------------

Also this question on lenses is essentially synonymous (except for the zweimal which yours doesn't mention) https://www.proz.com/kudoz/german_to_english/other/631537-zw...

 Mair A-W (PhD)GermanyLocal time: 06:37Native speaker of: EnglishPRO pts in category: 4
 Thank you

agree
 14 hrs

agree
 17 hrs

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