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It would certainly be a mistake to use the letter x as the multiplication symbol as x itself often denotes an algebraic term: e.g. compare. x x y = c. x x y = c. vs. x × y = c. x × y = c. The × or × or &#D7; character looks like this: × so it is a proper cross, as opposed to the letter x (ex) or * (asterisk) symbols which are a ...
According to Doctor Peterson of The Math Forum, using juxtaposition to denote multiplication arises out of the spoken form of saying $2x$ as "two-ex". Jeff Miller says that this can be found as early as the 15th century in Europe, and as early as the 10th century in India.
Shift+8 (the * symbol) For others searching with Command-f, the symbol in question is: ×. I don't think there is a way to input using a mac keyboard unfortunatly. Just to say that if you want a traditional 'times' sign, similar to the letter 'x', then there are a couple of ways of getting it. You could use Character Palette, and search under ...
Generally the multiplication sign is dropped for convenience. I suspect part of the reason for it in physics (which is where a lot of mathematical notation got its start) is that you can multiply anything together, but other operations have requirements on units. So you end up doing a lot more multiplying.
That's much better than what I said. @tekknolagi By the way, to typeset this symbol in LaTeX, one would use the \prod command rather than the greek symbol \Pi (or \pi). This is similar to preferring \sum to \Sigma. @QiaochuYuan, What is the name of this operation? (e.g.
That's Fortran syntax. An idea for different syntax: ^ can be hard to type with some keyboard layouts. With German (or ...) layout, for example, the key for it lies above the TAB key. Additionally, n^a will be put as nâ; you have to hit the awkwardly placed key twice to get ^ out. * is situated better.
With this interpretation 1 ÷ 2x is equal to (1 ÷ 2)x.1[6] However, in some of the academic literature, multiplication denoted by juxtaposition (also known as implied multiplication) is interpreted as having higher precedence than division, so that 1 ÷ 2x equals 1 ÷ (2x), not (1 ÷ 2)x. For example, the manuscript submission instructions for ...
$\begingroup$ Actually exactly the difference between addition and multiplication symbols may be helpful. In Germany multiplication is dot only, and division is a colon (i.e. two dots). Plus and minus are the same as everywhere. This allows to state the arithmetic precedence rules with only three words: "Punkt vor Strich", "dot before line".
Where is the multication sign on the apple keyboard Where is the multiplication sign on the keyboard 1825 3 Obelus vs. Slash in Numbers I find that the obelus (÷) sign is difficult to visually distinguish from the plus (+) sign in Numbers, and would prefer that Numbers displays division using the slash (/) sign.
$\begingroup$ You have arrived at the correct answer for what is written, however the multiplication sign DOES make a difference if it's written, because it then becomes 4:2x(1+1)=4:2x2=2x2=4, and that was the original question - does being written without a multiplication sign make a difference to the precedence, and the answer is yes, it does.