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 Aug 6 comment Do I have to use “a” or “an” before letters? In short @Rhjg all the rules of English grammar still apply :-) Aug 6 comment Do I have to use “a” or “an” before letters? Yes it does play the same role here. Apr 27 comment role of definitions in proofs Definitions do not, as you say, "define objects." Instead, as any dictionary shows, they define the words we use for objects. Where they come from would be a matter of accepted convention. Apr 24 comment Could somebody please help me prove this using the properties of real numbers introduced in elementary algebra? Is it logically correct to state "1 is its own reciprocal because 1 * 1 = 1." And to prove this by the identity property of multiplication: a * 1 = a? Given that we know, by definition, reciprocals are two numbers whose product is 1. Apr 24 comment Is an empty parenthesis a valid mathematical expression? Short answer: no. Apr 24 comment Could somebody please help me prove this using the properties of real numbers introduced in elementary algebra? In the equation 1/1 = 1 the right hand side is called a fraction in simplest form. Does that mean all the integers are fractions in simplest form? But a ratio in simplest form must be n/1 for n = integer? Apr 20 comment Finding all possible pairs of positive integer values But, if x is equal to y the ratio is undefined. Apr 20 comment Finding all possible pairs of positive integer values Why do you put the "equal to" into your condition: Assume x >= y? Apr 16 comment How would multiplying money work? But if that meal has a negative nutritional value "imagine" the complexities ;-) Feb 20 comment A set without the empty set Sometimes textbooks tell the reader that the symbol $\in$ is read "belongs to", how does anything belong to the empty set? Oct 20 comment Couple Probability @BrianM.Scott welcome back from skullpatrol, now known as Ice Boy, and the rest of the gang in the chatroom :-) Sep 26 comment How do you read the symbol “$\in$”? Would these two different roles of a variable be more clearly shown in the phrases: "any value of the variable in its domain" versus "the specific, but as of yet unknown, value of the variable"? Sep 26 comment “Negative” versus “Minus” clap, clap, clap Sep 19 comment How do you read the symbol “$\in$”? Thank you for the helpful links. Sep 19 comment High school math definition of a variable: the first step from the concrete into the abstract… Thank you for your answer(s). How is this question related to your answer here? Sep 18 comment How do you read the symbol “$\in$”? Ho Hey Jul 25 comment How find this limit $I=\lim_{n\to\infty}n^a\left(\int_{0}^{\pi/2}\sin{(nx)}\cos^n{x}dx\right)=b$ Please come back @Chris'ssis Jul 3 comment Trying to explain what “consistent” means to a middle schooler @DaveL.Renfro what would be the first math thing you would use? Jun 29 comment Trying to explain what “consistent” means to a middle schooler Thank you for the clear explanation, but how can this be shown at the elementary Algebra level studied in middle school at the age of 13 years old? May 3 comment What is the difference between equation and formula? Note: Not every equation is a formula; but by the above definitions, every formula must be an equation in algebra.