This series is excerpted from “Digital Signal Processing: Instant Access.” Order this book today and receive an additional 20% discount. Click here www.elsevierdirect.com and be sure to type in 92836.

Add Yahoo as a preferred source to see more of our stories on Google. Applied mathematicians use math to model real-world situations. Ariel Skelley/DigitalVision via Getty Images You can probably ...

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In spite of their name, “imaginary” numbers are as real as any other numbers, especially when it comes to hunting for lost treasure. For our first Insights puzzle of 2019, let’s go on a treasure hunt.

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