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         style="font-style:italic;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Italic'">a smooth function</tspan></text>
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         style="font-style:italic;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:sans-serif;-inkscape-font-specification:'sans-serif Italic'">a piecewise smooth</tspan><tspan
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         id="tspan5307">function, defined by</tspan><tspan
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         id="tspan5309">and approximating f</tspan></text>
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