bignum sqrt broken in erlang?

[Angel Alvarez]

Hi

let ab=N  
let M=(a+1)(b+1); 

M=ab+a+b+1  that is N +a +b +1  so M  > N

Ok but in erlang...

Erlang R13B01 (erts-5.7.2) [source] [rq:1] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.7.2  (abort with ^G)
1> N=71641520761751435455133616475667090434063332228247871795429.
71641520761751435455133616475667090434063332228247871795429

2> R0=trunc(math:sqrt(N)).
267659337146589062070609641472

3> R1=R0+1.
267659337146589062070609641473

4> M=R1*R1.
71641520761751431352030800763682813030352458120945601609729

5> M -N > 0.
false

where is the problem? That's erlang or the gmp library?

/Angel







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