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 			Solution 3.3:2a
			
			  From Förberedande kurs i matematik 1
			  
			  			                                                      
		          The logarithm 
lg 0
1 
is defined as that number which should stand in the (??) grey box in order that the equality
10??=0
1
should hold. In this case, we see that
10−1=0
1
and therefore 
lg 0
1=−1.