"An unitary" or "an union" or "an university" were used in the 18th century, but now "a" rather than "an" is standard when the initial sound is "yoo".
Use [−1,1] instead of [-1,1]. The little hyphen is too short to be a minus sign.
When you want to define the domain and codomain of the mapping use
but when you define the actual mapping function use
Standard function names
to prevent the function names from looking like a variable.
The imaginary unit i should not be confused with the common variable i. So to make the imaginary unit look different it is better to write
When a fraction is in a superscript or otherwise deeply embedded within some other notation, it is often more legible like this
than like this
Sets defined by using braces
This is another place where small spacing adjustments make notation look better. This
is better than this
Rate of change: The relationship between two numbers that are changing. To find it, you must divide. Formula: change in dependent variable/change in independent variable. Information by Daron Brown.
Probability: tells how likely something will happan. ex. The probability of a die landing on 4. Information by Daron Brown.
Equation: a math sentence that has an equal sign. ex. x + 3 = 10