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The phrase "activity was proof of" is correct and usable in written English.
You can use it to indicate that a certain activity serves as evidence or confirmation of something.
Example: "The team's consistent practice and improvement in their skills showed that their activity was proof of their dedication to the sport."
Alternatives: "activity demonstrated" or "activity served as evidence of".
Exact(1)
Hull City's transfer deadline day activity was proof of how far manager Steve Bruce has brought the club in a short space of time.
Similar(59)
He never publicly exhibited these, but this resumption of an earlier activity was proof that his careers as artist and architect were indivisible.
This was proof of life.
And it was proof of that tonight".
Mostly it was proof of concept.
Carrie Fisher was proof of that.
Although the global distribution of Crotalaria sp. that produce these types of toxins [ 44] does not overlap with the distribution of the loss of OCT1 activity, this substrate is proof of principle that lack of OCT1 activity could protect against ingested toxins.
"Obama's refusal to enforce immigration laws and his blatant suggestion that his chosen illegal activity will be rewarded are proof of his tyrannical tactics," she writes on her Facebook page.
In connection with the results presented in this paper, we suggest that the binding of C/EBPβ 3'UTR to CK18 should be considered not only as a means of intracellular localization (for the C/EBPβ mRNA), but also as a means of regulation; the formation of a complex by CK18, PKCε and C/EBPβ 3'UTR, and the decrease in activity of PKCε, may be proof of such a regulatory role.
Last month, the justice minister, Coulibaly Gnenema, said he was ready to prosecute anyone in the military if there is proof of illegal activity.
The logbook is analyzed at the end of each year of specialty training during the appraisal process, being proof of the activities performed and the achievement of educational objectives.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com