In algebra, one may define a function f(x) = x² + 2x³. For example, in Einstein's law, E = mc², E and m are variables, while c is constant. This usage is similar to the statement of physical laws. It simply says that the two expressions, (x + y)² on the left, and x² + 2xy + y² on the right are equal regardless of specific values of x and y. For example, (x + y)² = x² + 2xy + y² is a statement that is not supposed to be solved. The reason for the later usage I think is that in algebra a constant expression may contain variable-like symbols to denote generic numbers. Nowadays, they use the term "equation" in both cases, the former is being said to be a constant equation. If they include variables, A = B is called an equation. I was taught that the statement A = B in which A and B is constant, fixed expressions, is called an equality or identity. In this particular case, there is only one value of x which does the job, namely x = 3. The request to solve x + 1 = 4 means to find the value (or values) of x, which x + 1 is equal to 4. For example, x + 1 = 4, depending of what x may stand for, may or may not be correct. If the expressions A and B are not constant, i.e., if they contain variables, then most often A = B means a request to find the values of the variables, for which A becomes equal to B. While 1 + 2 ≠ 4 is a correct statement, 1 + 1 ≠ 2 is not. But the meaning is just the opposite from "=". The same holds for the symbol "≠", not equal. While 1 + 1 = 2 is a correct statement, 1 + 2 = 4 is not. So, being equal, does not necessarily mean being the same.Īlso, the statement that involves the symbol "=" may or may not be correct. For example, 1 + 1 does not look like 2 but the definitions of the symbols 1, 2, +, and the rules of arithmetic tell us that 1 + 1 = 2. The symbol of equality "=" is used to make a statement that two differently looking expressions are in fact equal. The sign "=" of equality which is pronounced "equal to" has other, more fruitful uses. One can't go wrong with expressions like N = N because they do not say much. For example, for any number or expression N, N = N.
If A and B are two constant expressions, we write A = B if they are equal, and A ≠ B, if they are not. These formulas work exactly the same in Google Sheets as in Excel.Less than, Equal to, Greater Than Symbols Read our article on Locking Cell References to learn more.
Instead, you should use locked cell references like this: =SUMIFS($C$3:$C$9,$B$3:$B$9,">"&E3) To make our formulas easier to read, we’ve shown the formulas without locked cell references: =SUMIFS(C3:C9,B3:B9,">"&E3)īut these formulas will not work properly when copy and pasted elsewhere in your file. Other logical operators can be used in this formula, such as: Now we add the logical operator within double quotes (“”) and use & to join the operator and the value: ">"&E3 Instead, it is more flexible to use a separate cell to define the criteria’s value. Usually, it is bad practice to “hard-code” values into formulas. To include Revenue from Order Numbers which are greater than or equal to 527, we can modify the the criteria like so (“>=527”): =SUMIFS(C3:C9,B3:B9,">=527") Sum if Greater Than – Cell References
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