Find the least positive integer $n$ ($n\geq 3$), such that among any $n$ points (no three are collinear) in the plane, there exist three points which are the vertices of a non-isoscele triangle.
To find the least positive integer \( n \) ( \( n \geq 3 \) ), such that among any \( n \) points (no three are collinear) in the plane, there exist three points which are the vertices of a non-isosceles triangle, we will prove that \( n = 7 \) fits the requirement.

1. **Lemma:**
   Assume that the set \( M \) consists of 5 points in the plane such that every triangle composed of three points of \( M \) is isosceles. Then there exists a set \( N \subset M \) consisting of 4 points \( A, B, C, D \) such that \( \overline{AB} = \overline{AC} = \overline{CD} \) and \( \overline{AD} = \overline{BC} = \overline{BD} \). Moreover, the fifth point \( E \in M \setminus N \) lies on the perpendicular bisectors of the sides \( \overline{AC} \) and \( \overline{BD} \) (since \( AC \parallel BD \)).

2. **Proof of the Lemma:**
   Let \( M = \{A, B, C, D, E\} \) be a given set with the property that every triangle composed of three points of \( M \) is isosceles. Since no three points are collinear, every edge of \( G \) appears at least twice. Let without loss of generality \( \overline{AB} = \overline{AC} \) and \( \overline{BC} = \overline{BD} \).

   Suppose that \( \overline{AB} = \overline{BD} \). Consider triangle \( \triangle ACD \). If \( \overline{AC} = \overline{AD} \), then \( D \) is the intersection of circles \( (A) \) and \( (B) \) with diameters \( \overline{AB} \). If \( \overline{AC} = \overline{CD} \), then \( D \) is the intersection of circles \( (C) \) and \( (B) \) with diameters \( \overline{AB} \). In both cases, \( ADBC \) is a rhombus composed of two equilateral triangles \( \triangle ADB \) and \( \triangle ABC \). Now, \( E \) does certainly not lie inside \( ADBC \) (if so, \( E \) must be the circumcenter of \( \triangle ADB \) or \( \triangle ABC \), a contradiction). Suppose now without loss of generality that \( \overline{BE} = \overline{BC} \) or \( \overline{CE} = \overline{BC} \) (since \( E \) must not lie on every perpendicular bisector). Then \( \overline{AE} \ne \overline{BC} \) and \( \overline{DE} \ne \overline{BC} \). Hence \( E \) lies on the perpendicular bisector of \( \overline{AD} \). Therefore, \( BC \perp DE \). But then triangle \( \triangle AEC \) is not isosceles, a contradiction. If \( \overline{AD} = \overline{CD} \), then \( D \) is the intersection of the perpendicular bisector of \( \overline{AC} \) and circle \( (B) \) with diameter \( \overline{AB} \). Suppose that \( AEBC \) is no rhombus composed of two equilateral triangles, since we already dealt with this case (just switch the roles of \( D \) and \( E \)) and consider triangle \( \triangle AEC \). Suppose without loss of generality that \( \overline{AE} = \overline{AC} \), since \( E \) must not lie on the perpendicular bisector of \( \overline{AC} \). Therefore, \( \overline{EC} = \overline{EB} \) (triangles \( \triangle ACB \) is isosceles), from which we conclude that \( E \) is the intersection of the perpendicular bisector of \( \overline{BC} \) and the circle \( (A) \) with diameter \( \overline{AB} \). Now there are just 4 possibilities for \( (D, E) \). It's easy to show that each of them leads to a contradiction. Therefore, we may suppose that \( \overline{AB} = \overline{AC} \) and \( \overline{BC} = \overline{BD} \), but \( \overline{AB} \ne \overline{BD} \). Consider two cases:

   1. Suppose that \( \overline{AD} = \overline{BD} \). Since \( \triangle ADC \) is isosceles, we either have \( \overline{AC} = \overline{CD} \) or \( \overline{AD} = \overline{DC} \). In the latter case, switching \( (A, B, C, D) \to (D, C, B, A) \) leads directly to the contradiction obtained one paragraph above. Hence \( \overline{AC} = \overline{CD} \) and thus \( \overline{AB} = \overline{AC} = \overline{CD} \) and \( \overline{AD} = \overline{BC} = \overline{BD} \). A quick angle chase shows that \( AC \perp BD \) and moreover \( \angle CBD = 36^{\circ} \) (this actually determines every angle in the configuration \( ADBC \)). Suppose that \( E \) does not lie on the perpendicular bisector of \( BD \) and let without loss of generality \( \overline{DE} = \overline{DB} \). If \( \overline{EC} = \overline{ED} \), then triangles \( \triangle BDC \) and \( \triangle EDC \) are concurrent, which means that \( E \) is the image of \( B \) when being reflected on \( DC \). But then \( A, C, E \) are collinear (this follows from the angles), which is a contradiction. Hence \( \overline{EC} = \overline{DC} \), which means that triangles \( \triangle EDC \) and \( \triangle ADC \) are concurrent. Consequently, \( B, C, E \) are concurrent (an angle chase again), which is a contradiction again. Hence \( E \) lies on the perpendicular of \( \overline{BD} \) which proves the lemma.

   2. Suppose that \( \overline{AD} = \overline{AB} \). Hence \( D \) is the intersection of circles \( (A) \) with diameter \( \overline{AB} \) and \( (B) \) with diameter \( \overline{BC} \). Without loss of generality suppose that \( E \) does not lie on the perpendicular bisector of \( \overline{AD} \) (since \( AB \) is an axis of symmetry). If \( \overline{AE} = \overline{AD} \), i.e. \( E \) belongs to the circumcircle of \( \triangle BCD \), we get \( \overline{BE} = \overline{DE} \). Let \( \angle DAB = \angle BAC = 2\alpha \). An angle chase now shows that triangle \( \triangle BEC \) has angles \( \angle BEC = \alpha \), \( \angle ECB = \frac{1}{2}\alpha \) and \( \angle CBE = 180 - \frac{3}{2}\alpha \). Since \( \triangle BEC \) is isosceles and \( \alpha \ne 90^{\circ} \), we get \( \alpha = 72^{\circ} \). Thus, if we switch \( (A, B, C, D, E) \to (E, D, B, A, C) \), the conditions of the lemma are fulfilled. Suppose now \( \overline{DE} = \overline{AD} \). If \( \overline{BE} = \overline{ED} \), \( ABED \) is a rhombus. Therefore, \( \overline{EC} = \overline{BC} \), since \( E \not\equiv A \). This yields \( \overline{DC} = \overline{AD} \), since \( C, A, E \) are not collinear, which is a contradiction. If \( \overline{BE} = \overline{BD} \), we get \( \overline{AE} = \overline{BE} \) as well, since \( E \not\equiv C, D \).

   This finally proves the lemma, since these are the only two cases we have to consider (\( \triangle ABD \) is isosceles and \( AB \ne BD \)). 

3. **Conclusion:**
   Suppose now we've got a set \( M \) consisting of 7 points, such that every triangle composed of three points of \( M \) is isosceles. By the lemma, there exist four points \( A, B, C, D \) of \( M \) such that they form an equilateral trapezoid and \( \overline{AB} = \overline{AC} = \overline{CD} \) and \( \overline{AD} = \overline{BC} = \overline{BD} \). Moreover, the remaining three points must all lie on the perpendicular bisector of \( \overline{AC} \), clearly a contradiction.

4. **Verification for \( n = 6 \):**
   To see that \( n = 6 \) does not fit, take a regular 5-gon and its circumcenter. Therefore, \( n = 7 \), as required.

\(\blacksquare\)

The final answer is \( \boxed{ n = 7 } \)