If u and v are the components of velocity in the x and y directions of a flow given by

u=ax+by; v=cx+dy

then the condition to be satisfied is -

- 1
  
  a+c=0
- 2
  
  b+d=0
- 3
  
  a+b+c+d=0
- 4
  
  a+d=0

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