Interesting note: as late as the 18th century, many mathematicians considered negative numbers to be "nonsense". Negative numbers did not become universally accepted as existing until about the same time that imaginary numbers did.
Before the wide-spread acceptance of negative numbers, payments were credits and deposits were debits.
A credit subtracted the payment from your balance, while a debit added the payment to your balance.
After the advent of negative numbers, it was shown that subtraction is simply adding a negative number. So a payment (which is a subtraction) can be reinterpreted to be a negative number being added to your balance.
An upward direction is usually considered positive.
It is considered neutral as it has no value.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Mathematically speaking, 0 is neither positive nor negative. In machine language in computers, 0 is considered as "positive" since the negative flag is not set.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
In thermodynamics, work done by the system is considered positive. Work done on the system is considered negative.
Electron flow is considered to be negative to positive whereas conventional current flow is considered to be positive to negative.
Sincerity is almost universally considered a positive trait.
Protons are considered positive.
An upward direction is usually considered positive.
It is considered neutral as it has no value.
Positive + Negative = Negative Negative + Negative = Positive Positive + Positive = Positive Negative + Positive = Negative
Negative * positive = negative Positive * positive = positive Negative * negative = positive
The "anode" is usually considered to be "negative". However in some experiments such as Gel Electrophoresis the anode is positive.
Steps that are considered positive by one side are likely to be considered negative by the opposite side.
The flow of current in electrodes is from the negative electrode (anode) to the positive electrode (cathode). This flow is conventionally considered as the direction of electron flow.
Mathematically speaking, 0 is neither positive nor negative. In machine language in computers, 0 is considered as "positive" since the negative flag is not set.