I have different equations in different sections / Appendix while writing my thesis. I am already using amsmath package and used the \numberwithin{equation}{section} in preamble. However, while I label equations as they occur in the section, e.g. In Section 1 the first equation is labelled as {eq:1} and In Appendix A, the first equation is labeled as {eq:1} as well.

When compiling, the equations are correctly labeled in the .pdf document, but I receive errors of multiple labeling. It is not easy to change equations in the main text of thesis and keep changing the labeling in Appendix as well.

I have tried finding this query but not successful. Can someone point me in the right direction? Any help is appreciated.

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    Do not use numerical labels, use describing values like archimedes or einstein or wombat . – Johannes_B Jul 29 '17 at 8:16
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    Crosspost – Johannes_B Jul 29 '17 at 8:42
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    Using the same label name is always a logical error. And what Johannes_B said, so use \label{app:eq:foo} etc. – user31729 Jul 29 '17 at 8:57
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    @cfr I'll have a loik later today. – Johannes_B Aug 1 '17 at 5:03
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    I'm voting to close this question as off-topic because it is solved in comments – Andrew Swann Nov 14 '17 at 16:26