When speaking of a sequence of events, you would use the word "first," rather than the phrase "at first." For example, "First we went to the park, then we ate dinner." "At first" would be used to describe a change in one specific event. For example, "At first the weather at the park was very nice, but then it started to rain."
expressions don't have an equal sign and equations do
Yes. An equation has an "=" sign.
one is conditional (even IF) and one is not.
-9
In SQL, the UNION operation combines the result sets of two or more queries into a single result set, removing any duplicate rows. The INTERSECT operation returns only the common rows that appear in both result sets of two or more queries.
These expressions are synonyms; sometimes atomic symbol is used for the name of an isotope.
when a symbol such as <or> is placed between two expressions
The expression x - 3 is simply (3 - x) multipled by -1
Difference between first shifting and second shifting theorem
when a symbol such as <or> is placed between two expressions
If these expressions are stand-alone (not nested), then they do the same thing, ie increment 'n'.
Functions and Expressions are representations of relationships that exist among entities, however a function always returns a value (or result)