## Uniplanar Algebra: Being Part I of a Prop©¡deutic to the Higher Mathematical Analysis |

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according addition and subtraction Addition Theorem Agenda algebraic operation amplitude antecedent arc-ratio arcs arithmetic base Benjamin Peirce called chords circular sector coincidence commutative law complex quantities consequent construction Corollary corresponding cosh cosK defined definition denoted direction distance equation equimultiples Euclid's Elements expK exponential expressed formula functions geometric addition given ratio goniometric ratios Hence Hyperbolic Ratios hyperbolic sector imaginary indeterminate form integers intercept inverse law of indices law of involution length less logarithmic spirals logarithms logK metathesis modulus Multiplication and Division natural logarithms negative magnitude obvious Orthomorphosis plane Plane Geometry points of division polynomial Prop proportion Proposition Proposition 13 prove quotient radii ratios be equal real axis real magnitudes real quantities real unit reciprocal represent respectively sinh speed tangent tanh tensor three magnitudes tion triangle unit circle zero

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9 ÆäÀÌÁö - Magnitudes which have the same ratio to the same magnitude, are equal to one another: and those to which the same magnitude has the same ratio, are, equal to one another.

8 ÆäÀÌÁö - Equal magnitudes have the same ratio to the same magnitude : and the same has the same ratio to equal magnitudes.

7 ÆäÀÌÁö - PROPORTION when the ratio of the first to the second is equal to the ratio of the second to the third.

36 ÆäÀÌÁö - In any proportion, the product of the means is equal to the product of the extremes.

7 ÆäÀÌÁö - This proposition, which is to the effect that " Ratios which are equal to the same ratio are equal to one another...

9 ÆäÀÌÁö - Of unequal magnitudes the greater has a greater ratio to the same than the less has : and the same magnitude has a greater ratio to the less than it has to the greater.

3 ÆäÀÌÁö - A LESS magnitude is said to be a part of a greater magnitude, when the less measures the greater; that is, when the less is contained a certain number of times exactly in the greater.

7 ÆäÀÌÁö - Four quantities are in proportion when the ratio of the first to the second is equal to the ratio of the third to the fourth.

4 ÆäÀÌÁö - The ratio of one magnitude to another of the same kind is the quotient obtained by dividing the numerical measure of the first by that of the second, the unit being the same in each case.

15 ÆäÀÌÁö - Conversely, if a straight line divides two sides of a triangle proportionally, it is parallel to the third side. Let DE divide the sides AB, AC, of the triangle ABC, proportionally; then DE is parallel to BC. For, if DE is not parallel to BC, let some other line DE', drawn through D, be parallel to BC. Then, by Proposition L, AB: But, by hypothesis, we have AB: AD = AC: AE. Hence AC AE' AC AE