## Can Texas Legally Secede from the United States?

Following the November 6 elections, thousands of residents have signed petitions requesting that their state …

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What is a “factorial,” and how is it used in mathematics? The Mathematical Definition of …

Read MoreIntroducing the Factorial: the Exclamation Mark of Math

Our reader’s question is: “There are two sets of symbols for ‘union’ and ‘intersection’. One …

Read MoreIntroducing Math Symbols for Union and Intersection