Lecture-1 Class 12 Maths

लहरों का शांत देखकर ये मत समझना,की समंदर में रवानी नहीं है,
जब भी उठेंगे तूफ़ान बनकर उठेंगे,अभी उठने की ठानी नहीं है…

Lecture - 1 Relations and Functions

Logics for this lecture:

Relation \subseteq Cartesian Product
Relation on set A is defined as  R \subseteq A \times A
\phi and A \times A are two extreme subsets of   A \times A
If R = \phi , then relation is called empty relation.
If R = A \times A , then relation is called universal relation.
Both empty and universal relations are also known as trivial relations.

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