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# Further Pure Mathematics 1

From the OCR Specification
by

## Luke Storry

on 4 May 2014

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#### Transcript of Further Pure Mathematics 1

Further Pure Mathematics 1
Luke Storry
Proof
Algebra

Matrices
Equality
two complex numbers are equal if and only if both the real and imaginary parts are equal.
Conjugate Pairs
The curve meets the X axis twice. The +/- in this formula leads to two CONJUGATE complex numbers, one with a plus and one with a minus. the second has a star superscript:
Complex Numbers
Like Algebra:
Argand Diagrams
Be able to solve any quadratic equation with real coefficients.
For polynomial equations with real coefficients, the complex roots come in pairs, with the others being real roots.
Modulus-Argument form
To simplify division, use complex conjugates:
USING THE SPEC:
http://www.ocr.org.uk/Images/75811-specification.pdf
Curve Sketching
Be able to sketch the graph of y=f(x), obtaining information about:
symmetry,
asymptotes parallel to the axes,
intercepts with the coordinate axes,
behaviour near x=0,
behavior for numerically large x.
need to label all of these!
Direction from which a Curve approaches an Asymptote
plug in values either side of the asymptote.
eg, if alpha was the asymptote:
(for rational functions)
Loci
(On the Argand Diagram)
Circles:
|z-a|=r
Half lines:
arg(z-a)=theta
Graphical calculators are awesome, but working still needs to be shown!
Definitions
only need to understand the starred ones:
Identity/Equation
An equation is only true for only certain values.
An identity is true for all values of all the variables.
Proof by Induction
VERY USEFUL VIDEO
This question is explicitly stated in the specification!
Difference between a sequence and a series
Sums
Convergence
Be able to manipulate simple algebraic inequalities, to deduce the solution of such an inequality.
Series
Inequalities
Roots
Appreciate the relationship between
the roots and coefficients of
Form a new equation whose roots are related to the roots of a given equation
1) Find sum and products of roots of original equation
2) Multiply and sum new roots
3) Substitute numbers from (1) into equations from (2)
4) Simplify to give new equation
by using sum= -b/a, etc
A sequence is an ordered set of "things".

A series is a summation over a sequence
Summing arithmetic progressions over large ranges can be very time consuming.
these formulae only work if we start from 1
eg:
There are formulae that can allow us to calculate the sum more easily:
Know the meaning of the word converge when applied to either a sequence or a series.
For more detail:
http://en.wikibooks.org/wiki/A-level_Mathematics/OCR/FP1/Complex_Numbers
f(x) =(x-a)(x-b)(x-c)
= (x^2-(a+b)x+ab)(x-c)
=(x^3 - (a+b+c)x^2 + (ab+bc+ac)x - abc
Solving inequalities works very similarly to solving equations, but the sign swaps when multiplying or dividing by a negative number
Some Rules
Linear Example:
Draw it!!
solve like an equality,
then sketch it.
When the differences between terms decreases, so the values tend towards a constant.
r < 1
Zero Matrix
Identity Matrix
Equality
Matrix multiplication is associative but not commutative.
Multiplication Rules
Subtract
Multiply
Matrix * Scalar
Both matrices must have the same order
Same as addition: do each value separately
Again, they must havethe same order
Multiply each individual value of the matrix by the scalar
Orders
It does what 0 does in normal multiplications, but for matrix multiplication
It does what 1 does in normal multiplications, but for matrix multiplication
For A and B to be equal, they must have the same size and shape and they must have the same values in the same spots.
eg:
3y = 33
y = 11
Linear Transformations
Be able to find the matrix associated with a linear transformation and vice-versa
How to find the matrix for a transformation
Combinations of Transformations
(related to matrix multiplication)
Useful ones to know
Don't need to memorize any, just need to be able to calculate them
IN DATA BOOK
Invariance
Invariant Points
Lines of Invariant Points
How to find them
Inverse
Determinant
Equals the area scale factor of the transformation represented by the matrix
Significance of detM=0
This means that the matrix doesn't have an inverse, so is "singular".
An invariant point is one which is left unchanged by a transformation.
Under the identity matrix all points are invariant, and that the point (0,0) is invariant under all transformation matrices.
A line of invariant points is where all points on a certain straight line are invariant for a specific matrix.
Can't divide a matrix, but inverses give a way of doing a similar operation:
What?
How to find?
Product rule:
Then, to solve an equation:
but use the notation:
Since these are the same equation, there must be a line of invariant points:

This shows that if y is equal to -x, then the point (x,y) will be invariant for this matrix, so any point on that line is an invariant point for this matrix.
Solution of Equations
Know how to use matrices to solve linear equations.
Geometrical Interpretation when a 2x2 matrix is singular.
Sense
The sense of the shape changes with the transformation if the determinant is negative.
('sense' = order of labelling)
If no real solutions:
Lines are parallel
If infinitely many solutions:
The two lines are the same line
Every point on each line is shared with the other line.
There are no points shared with both lines.
Do we need to know more?
Not according to specification, but the textbook goes further??
Full transcript