diff --git a/CMakeLists.txt b/CMakeLists.txt
index c72a778b..acb02565 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0)
 cmake_policy(SET CMP0017 NEW) # need include() with .cmake
 project(pip)
 set(pip_MAJOR    2)
-set(pip_MINOR    35)
+set(pip_MINOR    36)
 set(pip_REVISION 0)
 set(pip_SUFFIX   )
 set(pip_COMPANY  SHS)
diff --git a/libs/main/core/picout.cpp b/libs/main/core/picout.cpp
index dd55b0b5..138cc1ad 100644
--- a/libs/main/core/picout.cpp
+++ b/libs/main/core/picout.cpp
@@ -338,7 +338,7 @@ PICout PICout::operator <<(const PIFlags<PICoutManipulators::PICoutFormat> & v)
 	}
 
 
-PICout PICout::operator <<(const char * v) {if (!act_) return *this; if (v[0] == '\0') return *this; space(); quote(); PICOUTTOTARGET(v) quote(); return *this;}
+PICout PICout::operator <<(const char * v) {if (!act_ || !v) return *this; if (v[0] == '\0') return *this; space(); quote(); PICOUTTOTARGET(v) quote(); return *this;}
 
 PICout PICout::operator <<(const bool v) {if (!act_) return *this; space(); if (v) PICOUTTOTARGET("true") else PICOUTTOTARGET("false") return *this;}
 
diff --git a/libs/main/core/piobject.cpp b/libs/main/core/piobject.cpp
index 700a5ff8..feef0ca3 100644
--- a/libs/main/core/piobject.cpp
+++ b/libs/main/core/piobject.cpp
@@ -110,22 +110,80 @@
 //! \}
 
 
+PIObject::__MetaFunc::__MetaFunc() {
+	for (int i = 0; i < __PIOBJECT_MAX_ARGS__; ++i) {
+		types[i] = names[i] = nullptr;
+		types_id[i] = 0;
+	}
+}
+
+
+int PIObject::__MetaFunc::argumentsCount() const {
+	for (int i = 0; i < __PIOBJECT_MAX_ARGS__; ++i)
+		if (!types[i])
+			return i;
+	return __PIOBJECT_MAX_ARGS__;
+}
+
+
 PIString PIObject::__MetaFunc::arguments() const {
-	return types.join(",");
+	PIString ret;
+	for (int i = 0; i < __PIOBJECT_MAX_ARGS__; ++i) {
+		if (!types[i]) break;
+		if (!ret.isEmpty()) ret += ',';
+		ret += PIStringAscii(types[i]);
+	}
+	return ret;
 }
 
 
 PIString PIObject::__MetaFunc::fullFormat() const {
-	PIString ret = type_ret + " " + scope + "::" + func_name +"(";
-	for (int i = 0; i < types.size_s(); ++i) {
+	PIString ret = PIStringAscii(type_ret) + " " +
+				   PIStringAscii(scope) + "::" +
+				   PIStringAscii(func_name) +"(";
+	for (int i = 0; i < __PIOBJECT_MAX_ARGS__; ++i) {
+		if (!types[i]) break;
 		if (i > 0) ret += ", ";
-		ret += types[i] + " " + names[i];
+		ret += PIStringAscii(types[i]) + " " + PIStringAscii(names[i]);
 	}
 	ret += ")";
 	return ret;
 }
 
 
+void PIObject::__MetaFunc::__setFuncName(const char * n) {
+	func_name = n;
+	func_name_id = PIStringAscii(n).hash();
+}
+
+
+void PIObject::__MetaFunc::__addArgument(const char * t, const char * n) {
+	for (int i = 0; i < __PIOBJECT_MAX_ARGS__; ++i) {
+		if (types[i]) continue;
+		types[i] = t;
+		names[i] = n;
+		types_id[i] = PIObject::simplifyType(t, false).hash();
+		break;
+	}
+	//PICout(PICoutManipulators::DefaultControls | PICoutManipulators::AddQuotes)
+	//		<< "__addArgument" << t << n << PIObject::simplifyType(t) << types_id.back();
+}
+
+
+bool PIObject::__MetaFunc::canConnectTo(const __MetaFunc & dst, int & args_count) const {
+	for (int i = 0; i < __PIOBJECT_MAX_ARGS__; ++i) {
+		//piCout << "canConnectTo" << i << types[i] << dst.types[i];
+		args_count = i;
+		if (!dst.types[i]) break;
+		if (!types[i]) return false;
+		if (types_id[i] != dst.types_id[i])
+			return false;
+	}
+	return true;
+
+}
+
+
 PIObject::PIObject(const PIString & name): _signature_(__PIOBJECT_SIGNATURE__), emitter_(0), thread_safe_(false), proc_event_queue(false) {
 	in_event_cnt = 0;
 	setName(name);
@@ -196,8 +254,13 @@ bool PIObject::executeQueued(PIObject * performer, const PIString & method, cons
 
 
 PIStringList PIObject::scopeList() const {
+	PIStringList ret;
+	ret.reserve(2);
 	PIMutexLocker ml(__meta_mutex());
-	return __meta_data()[classNameID()].scope_list;
+	const PIVector<const char *> & scope(__meta_data()[classNameID()].scope_list);
+	for (const char * c: scope)
+		ret = PIStringAscii(c);
+	return ret;
 }
 
 
@@ -212,10 +275,11 @@ PIStringList PIObject::methodsEH() const {
 
 
 bool PIObject::isMethodEHContains(const PIString & name) const {
+	uint search_id = name.hash();
 	PIMutexLocker ml(__meta_mutex());
 	const __MetaData & ehd(__meta_data()[classNameID()]);
 	for (auto eh = ehd.eh_func.constBegin(); eh != ehd.eh_func.constEnd(); eh++) {
-		if (eh.value().func_name == name)
+		if (eh.value().func_name_id == search_id)
 			return true;
 	}
 	return false;
@@ -223,10 +287,11 @@ bool PIObject::isMethodEHContains(const PIString & name) const {
 
 
 PIString PIObject::methodEHArguments(const PIString & name) const {
+	uint search_id = name.hash();
 	PIMutexLocker ml(__meta_mutex());
 	const __MetaData & ehd(__meta_data()[classNameID()]);
 	for (auto eh = ehd.eh_func.constBegin(); eh != ehd.eh_func.constEnd(); eh++) {
-		if (eh.value().func_name == name)
+		if (eh.value().func_name_id == search_id)
 			return eh.value().arguments();
 	}
 	return PIString();
@@ -234,10 +299,11 @@ PIString PIObject::methodEHArguments(const PIString & name) const {
 
 
 PIString PIObject::methodEHFullFormat(const PIString & name) const {
+	uint search_id = name.hash();
 	PIMutexLocker ml(__meta_mutex());
 	const __MetaData & ehd(__meta_data()[classNameID()]);
 	for (auto eh = ehd.eh_func.constBegin(); eh != ehd.eh_func.constEnd(); eh++) {
-		if (eh.value().func_name == name)
+		if (eh.value().func_name_id == search_id)
 			return eh.value().fullFormat();
 	}
 	return PIString();
@@ -250,10 +316,11 @@ PIString PIObject::methodEHFromAddr(const void * addr) const {
 
 
 PIVector<PIObject::__MetaFunc> PIObject::findEH(const PIString & name) const {
+	uint search_id = name.hash();
 	PIVector<__MetaFunc> ret;
 	const __MetaData & ehd(__meta_data()[classNameID()]);
 	for (auto eh = ehd.eh_func.constBegin(); eh != ehd.eh_func.constEnd(); eh++) {
-		if (eh.value().func_name == name)
+		if (eh.value().func_name_id == search_id)
 			ret << eh.value();
 	}
 	return ret;
@@ -313,10 +380,9 @@ PIObject::Connection PIObject::piConnectU(PIObject * src, const PIString & sig,
 		if (addr_src != 0) break;
 		piForeachC (__MetaFunc & fd, m_dest) {
 			if (addr_src != 0) break;
-			if (fs.arguments().startsWith(fd.arguments()) || fd.arguments().isEmpty()) {
+			if (fs.canConnectTo(fd, args)) {
 				addr_src = fs.addr;
 				addr_dest = que ? fd.addrV : fd.addr;
-				args = fd.names.size_s();
 			}
 		}
 	}
@@ -528,7 +594,7 @@ bool PIObject::findSuitableMethodV(const PIString & method, int args, int & ret_
 	int mfi = -1, ac = -1, mac = -1;
 	for (int i = 0; i < ml.size_s(); ++i) {
 		__MetaFunc & m(ml[i]);
-		int j = m.names.size_s();
+		int j = m.argumentsCount();
 		if (mac < 0 || mac > j) mac = j;
 		if ((j <= args) && (ac < j)) {
 			ac = j;
@@ -570,30 +636,46 @@ void PIObject::callAddrV(void * slot, void * obj, int args, const PIVector<PIVar
 }
 
 
-PIString PIObject::simplifyType(const char * a) {
+PIString PIObject::simplifyType(const char * a, bool readable) {
 	PIString ret = PIStringAscii(a).trim();
-	int white = -1;
-	for (int i = 0; i < ret.size_s(); ++i) {
-		bool iw = ret[i] == ' ' || ret[i] == '\t' || ret[i] == '\r' || ret[i] == '\n';
-		//piCout << i << iw << white;
-		if (white < 0) {
-			if (iw) {
-				white = i;
-				continue;
-			}
-		} else {
-			if (!iw) {
-				ret.replace(white, i - white, " ");
-				i = white;
-				white = -1;
-				//piCout << i;
+	if (readable) {
+		int white = -1;
+		for (int i = 0; i < ret.size_s(); ++i) {
+			bool iw = ret[i] == ' ' || ret[i] == '\t' || ret[i] == '\r' || ret[i] == '\n';
+			//piCout << i << iw << white;
+			if (white < 0) {
+				if (iw) {
+					white = i;
+					continue;
+				}
+			} else {
+				if (!iw) {
+					ret.replace(white, i - white, " ");
+					i = white;
+					white = -1;
+					//piCout << i;
+				}
 			}
 		}
+		ret.replaceAll(" [", '[');
+		ret.replaceAll(" ]", ']');
+		ret.replaceAll(" <", '<');
+		ret.replaceAll(" >", '>');
+		ret.replaceAll(" &", '&');
+		ret.replaceAll(" *", '*');
+		ret.replaceAll("[ ", '[');
+		ret.replaceAll("] ", ']');
+		ret.replaceAll("< ", '<');
+		ret.replaceAll("> ", '>');
+		ret.replaceAll("& ", '&');
+		ret.replaceAll("* ", '*');
+		if (ret.startsWith("const ") && ret.endsWith("&"))
+			ret.cutLeft(6).cutRight(1).trim();
+	} else {
+		if (ret.startsWith("const ") && ret.endsWith("&"))
+			ret.cutLeft(6).cutRight(1).trim();
+		ret.removeAll(' ').removeAll('\t').removeAll('\r').removeAll('\n');
 	}
-	ret.replaceAll(" &", "&");
-	ret.replaceAll(" *", "*");
-	if (ret.startsWith("const ") && ret.endsWith("&"))
-		ret.cutLeft(6).cutRight(1).trim();
 	return ret;
 }
 
@@ -632,13 +714,14 @@ void PIObject::dump(const PIString & line_prefix) const {
 		PIObject * dst = c.dest_o;
 		__MetaFunc ef = methodEH(c.signal);
 		PIString src(c.event);
-		if (!ef.func_name.isEmpty())
-			src = ef.func_name + "(" + ef.arguments() + ")";
+		if (ef.func_name)
+			src = PIStringAscii(ef.func_name) + "(" + ef.arguments() + ")";
 		if (dst) {
 			__MetaFunc hf = dst->methodEH(c.slot);
-			if (hf.func_name.isEmpty()) hf.func_name = "[BROKEN]";
-			else hf.func_name += "(" + hf.arguments() + ")";
-			PICout(PICoutManipulators::AddNewLine) << line_prefix << "        " << src << " -> " << dst->className() << " (" << c.dest << ", \"" << dst->name()  << "\")::" << hf.func_name;
+			PIString hf_fn;
+			if (!hf.func_name) hf_fn = "[BROKEN]";
+			else hf_fn = PIStringAscii(hf.func_name) + "(" + hf.arguments() + ")";
+			PICout(PICoutManipulators::AddNewLine) << line_prefix << "        " << src << " -> " << dst->className() << " (" << c.dest << ", \"" << dst->name()  << "\")::" << hf_fn;
 		} else {
 			PICout(PICoutManipulators::AddNewLine) << line_prefix << "        " << src << " -> " << "[lambda]";
 		}
@@ -693,7 +776,7 @@ bool dumpApplicationToFile(const PIString & path) {
 #endif
 
 
-void PIObject::__MetaData::addScope(const PIString & s, uint shash) {
+void PIObject::__MetaData::addScope(const char * s, uint shash) {
 	if (!scope_id.contains(shash)) {
 		scope_list << s;
 		scope_id << shash;
diff --git a/libs/main/core/piobject.h b/libs/main/core/piobject.h
index 1ae3b5d5..492b56e6 100644
--- a/libs/main/core/piobject.h
+++ b/libs/main/core/piobject.h
@@ -34,7 +34,6 @@
 #include "piqueue.h"
 #include "piobject_macros.h"
 
-
 typedef void (*Handler)(void * );
 
 class PIP_EXPORT PIObject {
@@ -123,6 +122,7 @@ public:
 	virtual uint classNameID() const {static uint ret = PIStringAscii("PIObject").hash(); return ret;}
 
 	static const PIString __classNameS() {return PIStringAscii("PIObject");}
+	static const char * __classNameCC() {return "PIObject";}
 	static uint __classNameIDS() {static uint ret = PIStringAscii("PIObject").hash(); return ret;}
 
 	//! \~english Returns parent class name
@@ -437,7 +437,8 @@ public:
 	template<typename T>
 	bool isTypeOf() const {
 		if (!isPIObject()) return false;
-		return scopeList().contains(T::__classNameS());
+		PIMutexLocker ml(__meta_mutex());
+		return __meta_data()[classNameID()].scope_id.contains(T::__classNameIDS());
 	}
 
 	//! \~english Returns cast to T if this is valid subclass "T" (check by \a isTypeOf()) or "nullptr"
@@ -459,26 +460,32 @@ public:
 	static bool isTypeOf(const PIObject * o) {return o->isTypeOf<T>();}
 	template<typename T>
 	static bool isTypeOf(const void * o) {return isTypeOf<T>((PIObject*)o);}
-	static PIString simplifyType(const char * a);
+	static PIString simplifyType(const char * a, bool readable = true);
 
 	struct PIP_EXPORT __MetaFunc {
-		__MetaFunc(): addr(0), addrV(0) {;}
-		bool isNull() const {return addr == 0;}
+		__MetaFunc();
+		bool isNull() const {return addr == nullptr;}
+		int argumentsCount() const;
 		PIString arguments() const;
 		PIString fullFormat() const;
-		void * addr;
-		void * addrV;
-		PIString func_name;
-		PIString type_ret;
-		PIString scope;
-		PIStringList types;
-		PIStringList names;
+		void __setFuncName(const char * n);
+		void __addArgument(const char * t, const char * n);
+		bool canConnectTo(const __MetaFunc & dst, int & args_count) const;
+		void * addr = nullptr;
+		void * addrV = nullptr;
+		uint func_name_id = 0;
+		const char * func_name = nullptr;
+		const char * type_ret = nullptr;
+		const char * scope = nullptr;
+		const char * types[__PIOBJECT_MAX_ARGS__];
+		const char * names[__PIOBJECT_MAX_ARGS__];
+		uint types_id[__PIOBJECT_MAX_ARGS__];
 	};
 
 	struct PIP_EXPORT __MetaData {
-		__MetaData() {scope_list << PIStringAscii("PIObject"); scope_id << PIStringAscii("PIObject").hash();}
-		void addScope(const PIString & s, uint shash);
-		PIStringList scope_list;
+		__MetaData() {scope_list << "PIObject"; scope_id << PIStringAscii("PIObject").hash();}
+		void addScope(const char * s, uint shash);
+		PIVector<const char *> scope_list;
 		PISet<uint> scope_id;
 		PISet<const void * > eh_set;
 		PIMap<const void * , __MetaFunc> eh_func;
diff --git a/libs/main/core/piobject_macros.h b/libs/main/core/piobject_macros.h
index a046c71d..e663c880 100644
--- a/libs/main/core/piobject_macros.h
+++ b/libs/main/core/piobject_macros.h
@@ -385,6 +385,7 @@
 #  define __PTYPE(t) __PIVariantTypeInfo__<t>::PureType
 #endif
 #define __VVALUE(t, v) v.value< __PTYPE(t) >()
+#define __PIOBJECT_MAX_ARGS__ 4
 
 
 #define PIOBJECT(name) \
@@ -392,6 +393,7 @@
 	typedef name __PIObject__; \
 	public: \
 	static const PIString __classNameS() {static PIString ret = PIStringAscii(#name); return ret;} \
+	static const char * __classNameCC() {return #name;} \
 	static uint __classNameIDS() {static uint ret = PIStringAscii(#name).hash(); return ret;} \
 	virtual const char * className() const {return #name;} \
 	virtual uint classNameID() const {static uint ret = PIStringAscii(#name).hash(); return ret;} \
@@ -411,7 +413,7 @@
 			__MetaData & eh(__meta_data()[id]); \
 			eh.eh_set << ehp.eh_set; \
 			eh.eh_func << ehp.eh_func; \
-			eh.addScope(__classNameS(), id); \
+			eh.addScope(__classNameCC(), id); \
 		} \
 	}; \
 	__BaseInitializer__ __base_init__;
@@ -431,7 +433,7 @@
 			eh.eh_func << ehp.eh_func; \
 			eh.scope_id = ehp.scope_id; \
 			eh.scope_list = ehp.scope_list; \
-			eh.addScope(__classNameS(), id); \
+			eh.addScope(__classNameCC(), id); \
 		} \
 	}; \
 	__ParentInitializer__ __parent_init__; \
@@ -443,92 +445,61 @@
 #define PIOBJECT_SUBCLASS(name, parent) PIOBJECT(name) PIOBJECT_PARENT(parent)
 
 
+#define __EH_INIT_BASE__(ret, name) \
+	PIMutexLocker ml(__meta_mutex()); \
+	__MetaData & eh(__meta_data()[__classNameIDS()]); \
+	if (eh.eh_set[fp]) return; \
+	eh.eh_set << fp; \
+	__MetaFunc & f(eh.eh_func[fp]); \
+	f.scope = __classNameCC(); \
+	f.__setFuncName(#name); \
+	f.addr = fp; \
+	f.addrV = fpV; \
+	f.type_ret = #ret;
+
 #define EH_INIT0(ret, name) \
 	STATIC_INITIALIZER_BEGIN \
-		PIMutexLocker ml(__meta_mutex()); \
-		__MetaData & eh(__meta_data()[__classNameIDS()]); \
 		void * fp = (void*)(ret(*)(void*))__stat_eh_##name##__; \
 		void * fpV = fp; \
-		if (eh.eh_set[fp]) return; \
-		eh.eh_set << fp; \
-		__MetaFunc & f(eh.eh_func[fp]); \
-		f.scope = __classNameS(); \
-		f.func_name = PIStringAscii(#name); \
-		f.addr = fp; \
-		f.addrV = fpV; \
-		f.type_ret = PIStringAscii(#ret); \
+		__EH_INIT_BASE__(ret, name) \
 	STATIC_INITIALIZER_END
 
 #define EH_INIT1(ret, name, a0, n0) \
 	STATIC_INITIALIZER_BEGIN \
-		PIMutexLocker ml(__meta_mutex()); \
-		__MetaData & eh(__meta_data()[__classNameIDS()]); \
 		void * fp = (void*)(ret(*)(void*, a0))__stat_eh_##name##__; \
 		void * fpV = (void*)(ret(*)(void*, const PIVariantSimple &))__stat_eh_v_##name##__; \
-		if (eh.eh_set[fp]) return; \
-		eh.eh_set << fp; \
-		__MetaFunc & f(eh.eh_func[fp]); \
-		f.scope = __classNameS(); \
-		f.func_name = PIStringAscii(#name); \
-		f.addr = fp; \
-		f.addrV = fpV; \
-		f.type_ret = PIStringAscii(#ret); \
-		f.types << PIObject::simplifyType(#a0); \
-		f.names << PIStringAscii(#n0); \
+		__EH_INIT_BASE__(ret, name) \
+		f.__addArgument(#a0, #n0); \
 	STATIC_INITIALIZER_END
 
 #define EH_INIT2(ret, name, a0, n0, a1, n1) \
 	STATIC_INITIALIZER_BEGIN \
-		PIMutexLocker ml(__meta_mutex()); \
-		__MetaData & eh(__meta_data()[__classNameIDS()]); \
 		void * fp = (void*)(ret(*)(void*, a0, a1))__stat_eh_##name##__; \
 		void * fpV = (void*)(ret(*)(void*, const PIVariantSimple &, const PIVariantSimple &))__stat_eh_v_##name##__; \
-		if (eh.eh_set[fp]) return; \
-		eh.eh_set << fp; \
-		__MetaFunc & f(eh.eh_func[fp]); \
-		f.scope = __classNameS(); \
-		f.func_name = PIStringAscii(#name); \
-		f.addr = fp; \
-		f.addrV = fpV; \
-		f.type_ret = PIStringAscii(#ret); \
-		f.types << PIObject::simplifyType(#a0) << PIObject::simplifyType(#a1); \
-		f.names << PIStringAscii(#n0) << PIStringAscii(#n1); \
+		__EH_INIT_BASE__(ret, name) \
+		f.__addArgument(#a0, #n0); \
+		f.__addArgument(#a1, #n1); \
 	STATIC_INITIALIZER_END
 
 #define EH_INIT3(ret, name, a0, n0, a1, n1, a2, n2) \
 	STATIC_INITIALIZER_BEGIN \
-		PIMutexLocker ml(__meta_mutex()); \
-		__MetaData & eh(__meta_data()[__classNameIDS()]); \
 		void * fp = (void*)(ret(*)(void*, a0, a1, a2))__stat_eh_##name##__; \
 		void * fpV = (void*)(ret(*)(void*, const PIVariantSimple &, const PIVariantSimple &, const PIVariantSimple &))__stat_eh_v_##name##__; \
-		if (eh.eh_set[fp]) return; \
-		eh.eh_set << fp; \
-		__MetaFunc & f(eh.eh_func[fp]); \
-		f.scope = __classNameS(); \
-		f.func_name = PIStringAscii(#name); \
-		f.addr = fp; \
-		f.addrV = fpV; \
-		f.type_ret = PIStringAscii(#ret); \
-		f.types << PIObject::simplifyType(#a0) << PIObject::simplifyType(#a1) << PIObject::simplifyType(#a2); \
-		f.names << PIStringAscii(#n0) << PIStringAscii(#n1) << PIStringAscii(#n2); \
+		__EH_INIT_BASE__(ret, name) \
+		f.__addArgument(#a0, #n0); \
+		f.__addArgument(#a1, #n1); \
+		f.__addArgument(#a2, #n2); \
 	STATIC_INITIALIZER_END
 
 #define EH_INIT4(ret, name, a0, n0, a1, n1, a2, n2, a3, n3) \
 	STATIC_INITIALIZER_BEGIN \
-		PIMutexLocker ml(__meta_mutex()); \
-		__MetaData & eh(__meta_data()[__classNameIDS()]); \
 		void * fp = (void*)(ret(*)(void*, a0, a1, a2, a3))__stat_eh_##name##__; \
 		void * fpV = (void*)(ret(*)(void*, const PIVariantSimple &, const PIVariantSimple &, const PIVariantSimple &, const PIVariantSimple &))__stat_eh_v_##name##__; \
-		if (eh.eh_set[fp]) return; \
-		eh.eh_set << fp; \
-		__MetaFunc & f(eh.eh_func[fp]); \
-		f.scope = __classNameS(); \
-		f.func_name = PIStringAscii(#name); \
-		f.addr = fp; \
-		f.addrV = fpV; \
-		f.type_ret = PIStringAscii(#ret); \
-		f.types << PIObject::simplifyType(#a0) << PIObject::simplifyType(#a1) << PIObject::simplifyType(#a2) << PIObject::simplifyType(#a3); \
-		f.names << PIStringAscii(#n0) << PIStringAscii(#n1) << PIStringAscii(#n2) << PIStringAscii(#n3); \
+		__EH_INIT_BASE__(ret, name) \
+		f.__addArgument(#a0, #n0); \
+		f.__addArgument(#a1, #n1); \
+		f.__addArgument(#a2, #n2); \
+		f.__addArgument(#a3, #n3); \
 	STATIC_INITIALIZER_END
 
 
diff --git a/tests/math/testpimathmatrixt.cpp b/tests/math/testpimathmatrixt.cpp
index 98fc78db..b015176c 100644
--- a/tests/math/testpimathmatrixt.cpp
+++ b/tests/math/testpimathmatrixt.cpp
@@ -376,7 +376,7 @@ TEST(PIMathMatrixT_Test, invert) {
 	d2 = matrix2.determinant();
 	matrix3 = matrix1;
 	matrix1.invert();
-	ASSERT_TRUE((matrix1 == matrix3) && (d1 == 1/d2));
+	ASSERT_TRUE((matrix1 == matrix3) && piCompare(d1, 1/d2));
 }
 
 TEST(PIMathMatrixT_Test, inverted) {