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Increment theorem : ウィキペディア英語版
Increment theorem
In non-standard analysis, a field of mathematics, the increment theorem states the following: Suppose a function ''y'' = ''f''(''x'') is differentiable at ''x'' and that Δ''x'' is infinitesimal. Then
:\Delta y = f'(x)\,\Delta x + \varepsilon\, \Delta x\,
for some infinitesimal ε, where
: \Delta y=f(x+\Delta x)-f(x).\,
If \scriptstyle\Delta x\not=0 then we may write
: \frac = f'(x)+\varepsilon,
which implies that \scriptstyle\frac\approx f'(x), or in other words that \scriptstyle \frac is infinitely close to \scriptstyle f'(x)\,, or \scriptstyle f'(x)\, is the standard part of \scriptstyle \frac.
== See also ==

*Non-standard calculus
*''Elementary Calculus: An Infinitesimal Approach''
*Abraham Robinson

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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