# Revert (reverse) \numberwithin effect

How can I revert the action of \numberwithin{mycounter}{section} so that mycounter does not reset with a new section?

Example: (This is not exactly my case but this is easy to understand.) I would like to have equation numbered within a section in the first part of the document, so I use \numberwithin{equation}{section}. But in the next part to number it directly. Like

Section 1
equation (1.1)
equation (1.2)
Section 2
equation (2.1)
equation (2.2)
equation (2.3)
\SomeCommandToPutHere{equation}
Section 3
equation (1)
equation (2)
equation (3)

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–  lockstep Jan 25 '12 at 22:21

The package chngcntr does exactly that:
\counterwithin{equation}{section}

Thanks, master! Just a note, the macro \counterwithout kills the effect of both \numberwithin and \counterwithin, which is terrific! –  yo' Jan 25 '12 at 21:29
Either use \numberwithin or \counterwithin, not both. –  egreg Jan 25 '12 at 21:31
... and what should I do if some package uses \numberwithin itself without giving me a chance to prevent it? And to the case, I was thinking about putting \let\numberwithin\counterwithin after loading both amsmath and chngcntr. –  yo' Jan 25 '12 at 21:38
The difference between \numberwithin and \counterwithin is that the former does a global redefinition, it shouldn't be a problem if \numberwithin is used only in the preamble. –  egreg Jan 25 '12 at 21:45