ABSTRACT: Let G=( V,E ) be a graph. The first Zagreb index of a graph G is defined as ∑ u∈V d G 2 ( u ) , where d G ( u ) is the degree of vertex u in G . In this paper, we obtain two lower bounds ...

If you’re looking for the Connections answer for Monday, July 21, 2025, read on—I’ll share some clues, tips, and strategies, and finally the solutions to all four categories. Along the way, I’ll ...

Will Kenton is an expert on the economy and investing laws and regulations. He previously held senior editorial roles at Investopedia and Kapitall Wire and holds a MA in Economics from The New School ...

A year ago, I wrote a piece here about how people were really using gen AI. That article seemed to hit a note: It was popular, featured in viral posts, and the beautiful accompanying infographic has ...

Sweeping new tariffs announced Wednesday by U.S. President Donald Trump provoked dismay, threats of countermeasures and urgent calls for further negotiations to make trade rules fairer. But responses ...

FRANKFURT, Germany (AP) — United States President Donald Trump’s sweeping new tariffs on American imports shocked governments and investors around the world, swiftly spurring both threats of ...

FRANKFURT, Germany — Sweeping new tariffs announced Wednesday by U.S. President Donald Trump provoked dismay, threats of countermeasures and urgent calls for further negotiations to make trade rules ...

Sweeping new tariffs announced Wednesday by U.S. President Donald Trump provoked dismay, threats of countermeasures and urgent calls for further negotiations to make trade rules fairer.