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What is meant when an author gives an expression, labeled say $(3.4)$ and then immediately below writes: (cf. eq $3.2$)? i.e. what does the cf. stand for?

Not sure this is completely necessary but for instance I am currently looking at the text Elementary Fluid Dynamics by Acheson and a clear example of this can be found on pg $103$ where the author gives equation $(3.134)$ and then immediately below writes (cf. eqn $(3.117)$).

Mjoseph
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    See equation 3.2. Cf.: "The abbreviation cf. (short for the Latin: confer/conferatur, both meaning 'compare') is used in writing to refer the reader to other material to make a comparison with the topic being discussed. " – Mauro ALLEGRANZA Jul 01 '22 at 15:23
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    Refer to eq. 3.2 – insipidintegrator Jul 01 '22 at 15:24
  • oh that's literally it - thanks! – Mjoseph Jul 01 '22 at 15:24
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    The "i.e." you use is another one of those Latin based abbreviations ("id est"), and so is "e.g." ("exempli gratia"= for instance). It's not so long ago (just a few centuries) scholars wrote in Latin, mostly. :) – wasn't me Jul 01 '22 at 15:41

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It means look at or compare with equation (3.2). Here is where the abbreviation comes from.

GFR
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