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  2. Blackboard bold - Wikipedia

    en.wikipedia.org/wiki/Blackboard_bold

    The style is most commonly used to represent the number sets (natural numbers), , (rational numbers), (real numbers), and (complex numbers). To imitate a bold typeface on a typewriter , a character can be typed over itself (called double-striking ); [ 1 ] symbols thus produced are called double-struck , and this name is sometimes adopted for ...

  3. Talk:Complex number - Wikipedia

    en.wikipedia.org/wiki/Talk:Complex_number

    I disagree with Jacobolus's #1 and #2 key-thing opinions. That geometry does not require the invention of the complex numbers. Complex numbers exist because of algebraic closure. Anyway, if we were willing to set aside rigor in the opening sentence, we would have much more freedom in writing succinct sentences that satisfy the typical reader's ...

  4. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    A complex number can be visually represented as a pair of numbers (a, b) forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the "imaginary unit", that satisfies i 2 = −1.

  5. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

  6. These Are America's Snowiest Cities And Towns - AOL

    www.aol.com/americas-snowiest-cities-towns...

    Here's how we compiled the list: We pored through 30-year average snowfall statistics of hundreds of locations in the U.S. from 1991 through 2020. We considered only those towns and cities with a ...

  7. Sentence (mathematical logic) - Wikipedia

    en.wikipedia.org/wiki/Sentence_(mathematical_logic)

    is a sentence. This sentence means that for every y, there is an x such that =. This sentence is true for positive real numbers, false for real numbers, and true for complex numbers. However, the formula (=) is not a sentence because of the presence of the free variable y.

  8. Got Holiday Stress? Here Are 10 Nighttime Activities to Help ...

    www.aol.com/got-holiday-stressies-are10...

    3. Limit non-sleep activities. From our phones, friends, and work, to our favorite Netflix shows, we receive a lot of stimulation during the day.

  9. Contact AOL customer support - AOL Help

    help.aol.com/articles/account-management...

    The AOL Help site is your starting point for getting support from AOL. Support may come via phone, chat, social media or help articles, depending on the question or issue you have. Chat support