Abstract: A combined cryptosystem with symmetric keys for encrypting messages is proposed. Its unique feature is the use of functions of a real variable as keys instead of natural numbers. Eight key ...

Have you ever thought of the humble SUM function as a secret weapon for advanced analytics? Most Excel users see it as a basic tool for adding numbers, but what if I told you it could do so much more?

Databases are essential for storing and retrieving structured data supporting business intelligence, research, and enterprise applications. Querying databases typically requires SQL, which varies ...

1 Institute of Mathematics, University of Lübeck, Lübeck, Germany 2 Institute of Mathematics, National Academy of Sciences of Ukraine, Kyiv, Ukraine This paper ...

You can use the Sum function in Microsoft Office Excel to sum columns of data, whether your data is in an Excel table or is simply a range in a column of your ...

Hello I'm trying to use a complex CASE expression within a sum() function, but I'm encountering difficulties due to type incompatibility. Here's an example of what I'm trying to achieve: The issue ...

Wondering how to sum a column in Excel? This question has been asked by thousands of students around the world. Whether you’re a beginner or an experienced user, learning different ways to sum up a ...

Excel is a powerful tool for data calculation and manipulation. To make the most of Excel’s capabilities, it’s essential to know how to use the functions available. Two of the most commonly used ...