αʹ. Τὰ τῷ αὐτῷ ἴσα καὶ ἀλλήλοις ἐστὶν ἴσα.
Translation from ( Euclid'S ELEMENTS OF GEOMETRY
The Greek text of J.L. Heiberg (1883-1885) )
1. Things equal to the same thing are also equal to one another.
Algebraicly stated: If a = c and b = c then a= b, a,b,c things that Euclid talks about in his book. (Figures, magnitudes etc)
This relates to the Transitive property of equality that states the exact same thing for the set of Real numbers(superset).
If a = c and b = c then a = b, a,b,c belong to R.
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They both have algebraic terms but an expression does not contain an equality sign whereas an equation does contain an equality sign
straight line
A sphere, a cylinder and a cone all have properties of a circle in them
6 (APEX)
Eigenvalues and eigenvectors are properties of a mathematical matrix.See related Wikipedia link for more details on what they are and some examples of how to use them for analysis.